CVE-2011-1766: n/a vulnerability

CVE-2011-1766: includes/User.php in MediaWiki before 1.16.5, when wgBlockDisablesLogin is enabled, does not clear certain...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 22:37 UTC (UTC+00:00)

Security readout for executives and security teams

This is an authentication-bypass flaw in old MediaWiki installations. If a site runs MediaWiki before 1.16.5 and uses wgBlockDisablesLogin, failed token verification may leave cached identity data behind, allowing a remote attacker to appear as another user via crafted cookies or an unattended workstation. Exposure is limited to legacy MediaWiki deployments before 1.16.5 where wgBlockDisablesLogin is enabled. Modern, upgraded, or unsupported-but-isolated systems may not be affected, but any internet-facing legacy wiki should be treated as higher priority. Prioritize remediation if any legacy MediaWiki wiki remains reachable by untrusted users. Authentication bypass can undermine content integrity and administrative controls, even though the issue is old and no active exploitation is cited in the provided sources. Mitigation focus: Upgrade MediaWiki to 1.16.5 or later per the MediaWiki security release.; Apply relevant Fedora package updates if MediaWiki was installed from Fedora packages.; Check current vendor guidance before changing authentication or block-related settings..

Prepared: Jun 28, 2026, 01:17 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 23, 2011, 22:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://bugzilla.redhat.com/show_bug.cgi?id=702512CVE reference · x_refsource_CONFIRM
https://bugzilla.wikimedia.org/show_bug.cgi?id=28639CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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