CVE-2026-45243

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.

CVSS 4.0

5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-25)

CWE

CWE-862

Published

2026-05-18

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• steipete:summarize

Packages (OSV)

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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