Vulnerability · Published May 18, 2026 · Assigned by VulnCheck

CVE-2026-45243Summarize < 0.15.1 Browser Extension Missing Authorization via Content Script

Medium 6.1

In plain English

A medium-severity missing authorization in summarize from steipete. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.2%top 90.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@steipete/summarize	0.15.0	GHSA-5624-2pmv-jx46

Affected products (as reported)

Vendor	Product	Versions
steipete	summarize	0 – before 0.15.1

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/steipete/summarize/releases/tag/v0.15.2 release-notes
https://github.com/steipete/summarize/pull/222 issue-tracking
https://github.com/steipete/summarize/commit/357544063af535bd574752622f9eb94be33ee5fd patch
https://www.vulncheck.com/advisories/summarize-browser-extension-missing-authorization-via-content-script third-party-advisory