Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The Semantic MediaWiki extension for Packagist (mediawiki/semantic-media-wiki) is vulnerable in versions from 3.1.0 before 7.0.0. A user with the edit right can insert a crafted data attribute through wikitext that the extension's JavaScript later writes into the page as HTML, enabling stored cross-site scripting that runs in other users' browsers. The fix is to upgrade to version 7.0.0.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.6 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0040, the 34th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:55 UTC First seen by agentprime
- 31 Oct 2026, 13:55 UTC Confirmed by OSV