Vulnerability · Published Sep 29, 2026 · Assigned by wikimedia-foundation
CVE-2026-103050Stored i18n XSS in MassMessage
Medium 6.1
In plain English
A medium-severity cross-site scripting in Mediawiki - MassMessage extension from The Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 95.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - MassMessage extension allows Stored XSS. This issue affects Mediawiki - MassMessage extension: before 1.46.1, 1.45.5, 1.43.10.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2026-103050 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2026-103050 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The Wikimedia Foundation | Mediawiki - MassMessage extension | 0 – before 1.46.1, 1.45.5, 1.43.10 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://phabricator.wikimedia.org/T432341 issue-tracking
- https://gerrit.wikimedia.org/r/c/1346089 mitigation