What’s Vulnerable › Vulnerabilities

CVE-2021-30458

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-09 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• Wikimedia Parsoid: before 0.11.1; from 0.12.0 before 0.12.2 — fixed in 0.11.1, 0.12.2

How to fix

Upgrade to a fixed version: Wikimedia Parsoid 0.11.1, 0.12.2. Check the vendor advisory for mitigations.

References

• https://phabricator.wikimedia.org/T279451
• https://security.gentoo.org/glsa/202107-40
• https://www.mediawiki.org/wiki/Parsoid
• https://phabricator.wikimedia.org/T279451
• https://security.gentoo.org/glsa/202107-40
• https://www.mediawiki.org/wiki/Parsoid

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