What’s Vulnerable › Vulnerabilities

CVE-2020-26120

• 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: yes
• Published: 2020-09-27 · updated 2026-06-17
• Weakness: CWE-79

Description

XSS exists in the MobileFrontend extension for MediaWiki before 1.34.4 because section.line is mishandled during regex section line replacement from PageGateway. Using crafted HTML, an attacker can elicit an XSS attack via jQuery's parseHTML method, which can cause image callbacks to fire even without the element being appended to the DOM.

Affected products

• Fedoraproject Fedora: 33
• Wikimedia Foundation MediaWiki: before 1.34.4 — fixed in 1.34.4

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.34.4. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/q/I42e079bc875d17b336ab015f3678eaedc26e10ea
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/
• https://phabricator.wikimedia.org/T262213
• https://gerrit.wikimedia.org/r/q/I42e079bc875d17b336ab015f3678eaedc26e10ea
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/
• https://phabricator.wikimedia.org/T262213

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