CVE-2021-30458

MEDIUM

Published Apr 9, 20215y ago · Modified Jun 17, 20262w ago

6.1 CVSS 3.1

Medium

Published Apr 9, 2021 5y ago

Last Modified Jun 17, 2026 2w ago

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 Details

Base Score

6.1

Exploitability

2.8

Impact

2.7

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction Required

Scope Changed

Confidentiality Low

Integrity Low

Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 2

Vendor	Product	Version	Range
wikimedia	parsoid	*	<0.11.1
wikimedia	parsoid	*	≥0.12.0 – <0.12.2

References 3

phabricator.wikimedia.org https://phabricator.wikimedia.org/T279451

Issue TrackingVendor Advisory
security.gentoo.org https://security.gentoo.org/glsa/202107-40

Third Party Advisory
mediawiki.org https://www.mediawiki.org/wiki/Parsoid

Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.