Is CVE-2026-45243 in the CISA KEV catalog?

No. CVE-2026-45243 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-45243?

CVE-2026-45243 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2026-45243?

CVE-2026-45243 has an EPSS score of 0.19% (9th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-45243?

Upgrade summarize to 0.15.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-45243

MEDIUM

6.1

CVSS v3

NVD

Description

Summarize prior to 0.15.1 contains a missing authorization vulnerability in the content script window.postMessage bridge that allows malicious pages to perform unauthorized operations on automation artifacts. Attackers can simulate runtime messages with spoofed sender identifiers to list, read, create, overwrite, or delete automation artifacts scoped to the affected tab without proper authorization checks.

CWE-862Missing Authorization

How to fix

Remediation Available

summarizeNVD

Affected:< 0.15.1Fixed in:0.15.1CVE-2026-45243derived from NVD

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

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.19%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Patch2

Third-Party Advisory1

vulncheck.com

Release Notes1

github.com

Related Vulnerabilities

Other CWE-862 (Missing Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-39226	Critical	9.8	100%	KEV	Fix
CVE-2022-0543	Critical	10.0	100%	KEV	Fix
CVE-2021-21978	Critical	9.8	99%	-	Fix
CVE-2023-52163	High	8.8	96%	KEV	-
CVE-2022-1329	High	8.8	93%	-	-
CVE-2023-6875	Critical	9.8	90%	-	-

Embed a live status badge for CVE-2026-45243

Markdown

[![CVE-2026-45243](https://tridentstack.com/cve/badge/CVE-2026-45243.svg)](https://tridentstack.com/cve/CVE-2026-45243)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-45243"><img src="https://tridentstack.com/cve/badge/CVE-2026-45243.svg" alt="CVE-2026-45243"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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 2026-05-19.