Medium severity · published Apr 9, 2021
CVE-2021-30458
An issue was discovered in Wikimedia Parsoid before 0.11.1 and 0.12.x before 0.12.2
6.1
CVSS
1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
Parsoid · Wikimedia
before 0.11.1; 0.12.0 before 0.12.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30458
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-30458
Issue Tracking
https://phabricator.wikimedia.org/T279451
Third Party Advisory
https://security.gentoo.org/glsa/202107-40
Vendor Advisory
https://www.mediawiki.org/wiki/Parsoid
More from Parsoid
4.8
CVE-2025-61638
Sanitizer::validateAttributes data-XSS