Is CVE-2026-8961 in the CISA KEV catalog?

No. CVE-2026-8961 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-8961?

CVE-2026-8961 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-8961?

CVE-2026-8961 has an EPSS score of 0.32% (24th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-8961?

Upgrade firefox on debian unstable to 151.0-1 or later. Fixes are available for 18 affected products.

CVE & CISA-KEV Catalog

CVE-2026-8961

MEDIUM

6.5

CVSS v3

NVD

Description

Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CWE-290

How to fix

Remediation Available

firefoxDebian

Fixed in:151.0-1CVE-2026-8961

firefoxRocky

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el7_9RHSA-2026:26551

Fixed in:0:140.11.0-1.el7_9.ppc64RHSA-2026:26551

Fixed in:0:140.11.0-1.el7_9RHSA-2026:26551

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26629

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26606

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26629

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

firefoxRed Hat / RHEL

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el7_9.ppc64RHSA-2026:26551

Fixed in:0:140.11.0-1.el7_9RHSA-2026:26551

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26606

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26629

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26629

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

firefox-debuginfoRocky

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el7_9RHSA-2026:26551

Fixed in:0:140.11.0-1.el7_9.ppc64RHSA-2026:26551

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26606

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26629

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

firefox-debuginfoRed Hat / RHEL

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el7_9RHSA-2026:26551

Fixed in:0:140.11.0-1.el7_9.ppc64RHSA-2026:26551

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26606

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26629

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

firefox-debugsourceRed Hat / RHEL

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26606

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26629

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

firefox-debugsourceRocky

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el10_2RHSA-2026:21380

Fixed in:0:140.11.0-1.el10_0RHSA-2026:27715

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26629

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26630

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26606

Fixed in:0:140.11.0-1.el8_10RHSA-2026:21382

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

firefox-x11Rocky

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

firefox-x11Red Hat / RHEL

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21378

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26492

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26493

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26491

thunderbirdRed Hat / RHEL

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26270

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26536

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26536

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

thunderbirdRocky

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26536

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26270

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26536

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

thunderbird-debuginfoRed Hat / RHEL

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26270

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26536

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

thunderbird-debuginfoRocky

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26270

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26536

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

thunderbird-debugsourceRocky

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26270

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26536

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

thunderbird-debugsourceRed Hat / RHEL

Fixed in:0:140.11.0-1.el10_2RHSA-2026:22325

Fixed in:0:140.11.0-1.el10_0RHSA-2026:26539

Fixed in:0:140.11.0-1.el8_6RHSA-2026:26536

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_4RHSA-2026:26270

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el8_8RHSA-2026:26268

Fixed in:0:140.11.0-1.el8_10RHSA-2026:22643

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

Fixed in:0:140.11.0-1.el9_8RHSA-2026:21381

Fixed in:0:140.11.0-1.el9_4RHSA-2026:26174

Fixed in:0:140.11.0-1.el9_6RHSA-2026:26521

Fixed in:0:140.11.0-1.el9_2RHSA-2026:26269

DeveloperEditionWindows application

Affected:140.11.0Fixed in:140.11.0Mozilla

Affected:151.0.0Fixed in:151.0.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:151.0.0Fixed in:151.0.0Mozilla

Affected:140.11.0Fixed in:140.11.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:140.11Fixed in:140.11Mozilla

Affected:151.0.0Fixed in:151.0.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Exploit Intelligence

0.32%probability of exploitation in 30 days

24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

Vendor Advisory4

Other references1

bugzilla.mozilla.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-20.