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Fencer Vulns
medium 5.3

CVE-2020-10960 json

MediaWiki makeCollapsible allows applying event handler to any CSS selector

published 2020-04-03 6 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2020-10960 , EUVD-2022-4752 , GHSA-pfm2-mqwj-ggm5

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Patch / fix

  • packagist mediawiki/core 1.31.7, 1.33.3, 1.34.1
  • bitnami mediawiki 1.34.1
  • mediawiki mediawiki 1.34.1
  • mediawiki Debian 14, Debian 13, Debian 12 1:1.31.7-1

debian advisories DEBIAN-CVE-2020-10960

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-10960 updated cvss 5.3

mediawiki: makeCollapsible allows applying event handler to any CSS selector

  • Red Hat OpenShift Container Platform 3.11 mediawiki Red Hat OpenShift Container Platform 4 mediawiki
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.15% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
packagist mediawiki/core
>=1.31.0, <1.31.7
>=1.33.0, <1.33.3
>=1.34.0, <1.34.1
1.31.7
1.33.3
1.34.1
bitnami mediawiki
<1.34.1
1.34.1

Classification

Weakness
  • CWE-116 Improper Encoding or Escaping of Output
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.