CVE-2021-30458 json
Wikimedia Parsoid vulnerable to Cross-site Scripting (XSS)
published 2021-04-09 5 y ago modified 2026-06-17 4 mo ago also GHSA-5pqx-77vf-85rw , EUVD-2022-2633
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
An issue was discovered in Wikimedia Parsoid before 0.11.1 and 0.12.x before 0.12.2. An attacker can send crafted wikitext that Utils/WTUtils.php will transform by using a <meta> tag, bypassing sanitization steps, and potentially allowing for XSS.
Patch / fix
- packagist wikimedia/parsoid 0.11.1, 0.12.2
- wikimedia parsoid 0.11.1, 0.12.2
- mediawiki Debian 14, Debian 13, Debian 12 1:1.35.2-1
debian advisories DEBIAN-CVE-2021-30458
- mediawiki Arch Linux 1.35.2-1
arch linux advisories AVG-1775
Exploit prediction
0.98% chance of exploitation in the next 30 days, higher than 62% 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 |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | wikimedia/parsoid | >=0.12, <0.12.2 <0.11.1 |
0.12.2 0.11.1 |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
security.gentoo.org
/glsa/202107-40
vendor-advisory, web, third-party-advisory
-
phabricator.wikimedia.org
/T279451
web, issue-tracking, vendor-advisory
-
mediawiki.org
/wiki/Parsoid
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-30458
advisory
-
github.com
/FriendsOfPHP/security-advisories/blob/master/wikimedia/parsoid/CVE-2021-30458.yaml
web
-
github.com
/wikimedia/mediawiki-services-parsoid
package
Sources
- CVE List CVE-2021-30458
- GitHub Advisory GHSA-5pqx-77vf-85rw
- NVD CVE-2021-30458
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.