CVE-2026-100241: Wikimedia Foundation Mediawiki – EventBus Extension · Information Exposure
Affects Wikimedia Foundation Mediawiki – EventBus ExtensionSource CVE Database V5
Not known to be exploited · CVSS 7.5 High.
Data as of 12 Nov 2026, 23:24 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 24% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers can reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-09-30.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExploitation evidence
Disclosed: evidence found.
CVE published 29 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Wikimedia FoundationMediawiki - EventBus Extension | Affected
| Fixed in– |
AI-suggested
Users of Mediawiki EventBus Extension version 1.47.0-alpha should monitor the Wikimedia Foundation advisories for updates and apply any forthcoming patches promptly. Until a fix is available, consider restricting access to the affected extension or disabling it if feasible.
Description
CVE-2026-100241 is a vulnerability in the Wikimedia Foundation's Mediawiki EventBus Extension version 1.47.0-alpha that allows unauthorized exposure of sensitive information. The flaw is classified under CWE-200, indicating information disclosure to unauthorized actors. The vulnerability has a high severity with a CVSS score of 7.5, reflecting network attack vector, low complexity, no privileges required, and no user interaction needed. There is no indication of active exploitation in the wild or available patches at this time.