Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-45243

CVE-2026-45243MEDIUM

steipete summarize — Summarize < 0.15.1 Browser Extension Missing Authorization via Content Script

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   P   N   N   N    5.3   .0033   24.5     —

AFFECTED
  Product    Versions     Fixed
  summarize  unspecified  357544063af535bd574752622f9eb94be33ee5fd

TIMELINE
  May 11  Reserved by VulnCheck
  May 18  Published (CNA: VulnCheck)
  Oct 8   EXPLOIT PUBLISHED — CVE-2026-45243 (steipete summarize). Public exploit reference added.

CWE-862 · CNA: VulnCheck · CVSS v4.0 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 11, 2026	Reserved	Reserved by VulnCheck
May 18, 2026	Published	Published (CNA: VulnCheck)
October 8, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-45243 (steipete summarize). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
steipete	summarize	—	—	357544063af535bd574752622f9eb94be33ee5fd

Weaknesses

CWE-862

References (4)

https://github.com/steipete/summarize/commit/357544063af535bd574752622f9eb94be33ee5fd [Patch]
https://github.com/steipete/summarize/pull/222 [Exploit, Issue Tracking, Patch]
https://github.com/steipete/summarize/releases/tag/v0.15.2 [Release Notes]
https://www.vulncheck.com/advisories/summarize-browser-extension-missing-authorization-via-content-script [Third Party Advisory]

Authoritative record: CVE-2026-45243 at cve.org

Vendors: steipete

Weaknesses: CWE-862

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-45243 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.