Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/htmlform/fields/HTMLMultiSelectField.Php.
This issue affects MediaWiki: before 1.39.12, 1.42.6, 1.43.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Wikimedia Foundation | MediaWiki | < 1.39.12, 1.42.6, 1.43.1 | 1.39.12, 1.42.6, 1.43.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mediawiki | 1:1.43.1+dfsg-1 | — |
| Debian 13 | mediawiki | 1:1.43.1+dfsg-1 | — |
| Debian 12 | mediawiki | 1:1.39.12-1~deb12u1 | DSA-5901-1 |
| Debian 11 | mediawiki | 1:1.35.13-1+deb11u4 | DLA-4249-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mediawiki | No fix yet | — |
| Ubuntu 26.04 LTS | mediawiki | No fix yet | — |
| Ubuntu 25.10 | mediawiki | No fix yet | — |
| Ubuntu 18.04 LTS | mediawiki | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | mediawiki | No fix yet | — |
| Ubuntu Pro 22.04 LTS | mediawiki | No fix yet | — |
| Ubuntu Pro 20.04 LTS | mediawiki | No fix yet | — |
Advisories 3
- DSA-5901-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4249-1 mediawiki - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2025-0788 MediaWiki: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 23, 2025