CVE-2026-45243: steipete summarize · Missing Authorization
Affects steipete summarizeSource CVE Database V5
Not known to be exploited · CVSS 5.3 Medium : upgrade to 0.15.1 when convenient.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 0.15.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 18 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade steipete/summarize and summarize to 0.15.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| steipetesummarize | Affected
| Fixed in– |
GitHubsteipete/summarizepkg:github/steipete/summarizeOther threats | Affected
| Fixed in
|
GitHubsummarizepkg:github/summarizeOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
If you cannot patch yet, users should exercise caution when visiting untrusted web pages and consider restricting or monitoring the use of the summarize extension in sensitive environments.
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.
References
- github.com/steipete/summarize/releases/tag/v0.15.2 (opens in a new tab)
- github.com/steipete/summarize/pull/222 (opens in a new tab)
- github.com/steipete/summarize/commit/357544063af535bd574752622f9eb94be33ee5fd (opens in a new tab)
- vulncheck.com/advisories/summarize-browser-extension-missing-authorization-via-content-script (opens in a new tab)