What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-18 · updated 2026-10-14
• Weakness: CWE-862

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 products

• steipete summarize: before 0.15.1 — fixed in 0.15.1

How to fix

Upgrade to a fixed version: steipete summarize 0.15.1. Check the vendor advisory for mitigations.

References

• https://github.com/steipete/summarize/commit/357544063af535bd574752622f9eb94be33ee5fd
• https://github.com/steipete/summarize/pull/222
• https://github.com/steipete/summarize/releases/tag/v0.15.2
• https://www.vulncheck.com/advisories/summarize-browser-extension-missing-authorization-via-content-script

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