CVE-2026-15718

MEDIUM

4.3

CVSS v3

Description

We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 140.13, and Thunderbird 140.13.

CWE-763

How to fix

Remediation Available

firefoxDebian

Fixed in:152.0.6-1CVE-2026-15718

firefoxRocky

Fixed in:0:140.13.0-1.el10_2RHSA-2026:47101

Fixed in:0:140.13.0-1.el8_10RHSA-2026:47105

Fixed in:0:140.13.0-1.el9_8RHSA-2026:47104

firefoxRed Hat / RHEL

Fixed in:0:140.13.0-1.el10_2RHSA-2026:47101

Fixed in:0:140.13.0-1.el8_10RHSA-2026:47105

Fixed in:0:140.13.0-1.el9_8RHSA-2026:47104

firefox-debuginfoRocky

Fixed in:0:140.13.0-1.el10_2RHSA-2026:47101

Fixed in:0:140.13.0-1.el8_10RHSA-2026:47105

Fixed in:0:140.13.0-1.el9_8RHSA-2026:47104

firefox-debuginfoRed Hat / RHEL

Fixed in:0:140.13.0-1.el10_2RHSA-2026:47101

Fixed in:0:140.13.0-1.el8_10RHSA-2026:47105

Fixed in:0:140.13.0-1.el9_8RHSA-2026:47104

firefox-debugsourceRocky

Fixed in:0:140.13.0-1.el10_2RHSA-2026:47101

Fixed in:0:140.13.0-1.el8_10RHSA-2026:47105

Fixed in:0:140.13.0-1.el9_8RHSA-2026:47104

firefox-debugsourceRed Hat / RHEL

Fixed in:0:140.13.0-1.el10_2RHSA-2026:47101

Fixed in:0:140.13.0-1.el8_10RHSA-2026:47105

Fixed in:0:140.13.0-1.el9_8RHSA-2026:47104

firefox-x11Rocky

Fixed in:0:140.13.0-1.el9_8RHSA-2026:47104

firefox-x11Red Hat / RHEL

Fixed in:0:140.13.0-1.el9_8RHSA-2026:47104

thunderbirdRocky

Fixed in:0:140.13.0-1.el10_2RHSA-2026:49621

Fixed in:0:140.13.0-1.el8_10RHSA-2026:49922

Fixed in:0:140.13.0-1.el9_8RHSA-2026:49921

thunderbirdRed Hat / RHEL

Fixed in:0:140.13.0-1.el10_2RHSA-2026:49621

Fixed in:0:140.13.0-1.el8_10RHSA-2026:49922

Fixed in:0:140.13.0-1.el9_8RHSA-2026:49921

thunderbird-debuginfoRocky

Fixed in:0:140.13.0-1.el10_2RHSA-2026:49621

Fixed in:0:140.13.0-1.el8_10RHSA-2026:49922

Fixed in:0:140.13.0-1.el9_8RHSA-2026:49921

thunderbird-debuginfoRed Hat / RHEL

Fixed in:0:140.13.0-1.el10_2RHSA-2026:49621

Fixed in:0:140.13.0-1.el8_10RHSA-2026:49922

Fixed in:0:140.13.0-1.el9_8RHSA-2026:49921

thunderbird-debugsourceRed Hat / RHEL

Fixed in:0:140.13.0-1.el10_2RHSA-2026:49621

Fixed in:0:140.13.0-1.el8_10RHSA-2026:49922

Fixed in:0:140.13.0-1.el9_8RHSA-2026:49921

thunderbird-debugsourceRocky

Fixed in:0:140.13.0-1.el10_2RHSA-2026:49621

Fixed in:0:140.13.0-1.el8_10RHSA-2026:49922

Fixed in:0:140.13.0-1.el9_8RHSA-2026:49921

DeveloperEditionWindows application

Affected:152.0.6Fixed in:152.0.6Mozilla

Mozilla Firefox (en-US)Windows application

Affected:152.0.6Fixed in:152.0.6Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.38%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Other references3

Related Vulnerabilities

Other CWE-763 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2007-4367	High	9.3	8.2%	-	Fix
CVE-2015-2695	Medium	5.0	6.2%	-	Fix
CVE-2013-4695	High	7.8	5.3%	-	-
CVE-2020-36224	High	7.5	4.3%	-	Fix
CVE-2022-31625	High	8.1	3.4%	-	Fix
CVE-2021-42377	Critical	9.8	3.4%	-	Fix

Common questions

How do I fix CVE-2026-15718?

Published advisories record a fix for 17 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-15718 being actively exploited?

Not that we know of. CVE-2026-15718 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.38% is the estimated probability that it will be exploited in the next 30 days. That is higher than 31% of all scored CVEs.

How severe is CVE-2026-15718?

CVE-2026-15718 has a CVSS v3 base score of 4.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-15718 affect?

Published advisories record a fix for firefox (Debian), firefox (Rocky), firefox (Red Hat / RHEL), firefox-debuginfo (Rocky), and 13 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-15718

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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 2026-07-22.