CVE-2021-34364 json
The Refined GitHub browser extension before 21.6.8 might allow XSS via a link in a document.
published 2021-06-09 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21023
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 52%
- public exploits
- 0
- none known
Summary
The Refined GitHub browser extension before 21.6.8 might allow XSS via a link in a document. NOTE: github.com sends Content-Security-Policy headers to, in general, address XSS and other concerns.
Patch / fix
- refined-github_project refined-github 21.6.8
Exploit prediction
0.69% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
vuln.ryotak.me
/advisories/47
third-party-advisory
-
github.com
/sindresorhus/refined-github/releases/tag/21.6.8
release-notes, third-party-advisory
Sources
- CVE List CVE-2021-34364
- NVD CVE-2021-34364
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.