CVE-2026-45243 json
Summarize < 0.15.1 Browser Extension Missing Authorization via Content Script
published 2026-05-18 5 mo ago modified 2026-11-08 24 h ago also EUVD-2026-30794 , GHSA-5624-2pmv-jx46
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm @steipete/summarize 0.15.0
- steipete summarize 0.15.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/steipete/summarize/pull/222 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N |
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| CNA | 4.0 | 5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @steipete/summarize | <0.15.0 |
0.15.0 |
Affected products
- steipete summarize
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/steipete/summarize/pull/222
issue-tracking, patch, web, exploit
-
github.com
/steipete/summarize/commit/357544063af535bd574752622f9eb94be33ee5fd
patch, web
-
github.com
/steipete/summarize/releases/tag/v0.15.2
release-notes, web
-
vulncheck.com
/advisories/summarize-browser-extension-missing-authorization-via-content-script
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-45243
advisory
-
github.com
/steipete/summarize
package
-
github.com
/steipete/summarize/releases/tag/v0.15.1
web
Sources
- CVE List CVE-2026-45243
- GitHub Advisory GHSA-5624-2pmv-jx46
- NVD CVE-2026-45243
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