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CVE-2011-1766
includes/User.php in MediaWiki before 1.16.5, when wgBlockDisablesLogin is enabled, does not clear certain cached data after verification…
Medium5.8EPSS 2.2%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
includes/User.php in MediaWiki before 1.16.5, when wgBlockDisablesLogin is enabled, does not clear certain cached data after verification of an auth token fails, which allows remote attackers to bypass authentication by creating crafted wikiUserID and wikiUserName cookies, or by leveraging an unattended workstation.
Timeline
ID reserved
By redhat
- 34 days later
· 34 days later
Published
- 13 years later
· 13 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
- EPSS (exploitation in 30 days)
- 2.2% · top 17% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.
Weakness
Affected products
n/a
- affected n/a
References (8)
- FEDORA-2011-6774 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=702512 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugzilla.wikimedia.org/show_bug.cgi?id=28639 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 44684 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 47722 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- [mediawiki-announce] 20110505 MediaWiki security release 1.16.5 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- FEDORA-2011-6781 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2011-6775 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2011-1766)Record last updated .