CVE-2020-26120

Name: CVE-2020-26120
Creator: NVD / NIST
Published: 2020-09-27T21:15:13+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.98%

Last modified Jun 17, 2026

CVE-2020-26120 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 0.98% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.98%

57.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	< 1.34.4
Fedoraproject	Fedora	33

References

https://gerrit.wikimedia.org/r/q/I42e079bc875d17b336ab015f3678eaedc26e10eaVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/
https://phabricator.wikimedia.org/T262213Exploit, Issue Tracking, Patch, Vendor Advisory
https://gerrit.wikimedia.org/r/q/I42e079bc875d17b336ab015f3678eaedc26e10eaVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/
https://phabricator.wikimedia.org/T262213Exploit, Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Sep 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26120?

How severe is CVE-2020-26120?

CVE-2020-26120 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.98% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26120?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26120?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST