How severe is CVE-2011-1765?

CVE-2011-1765 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-1765 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1765?

CVE-2011-1765 primarily affects Mediawiki. In total, 137 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1765?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-1765 published?

CVE-2011-1765 was published on 2011-05-23 and last updated on 2026-06-16.

CVE-2011-1765

CVE-2011-1765 is a medium-severity vulnerability in Mediawiki with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mediawiki
Published: 2011-05-23
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in MediaWiki before 1.16.5, when Internet Explorer 6 or earlier is used, allows remote attackers to inject arbitrary web script or HTML via an uploaded file accessed with a dangerous extension such as .shtml at the end of the query string, in conjunction with a modified URI path that has a %2E sequence in place of the . (dot) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-1578 and CVE-2011-1587.

Frequently asked questions

What is CVE-2011-1765?: Cross-site scripting (XSS) vulnerability in MediaWiki before 1.16.5, when Internet Explorer 6 or earlier is used, allows remote attackers to inject arbitrary web script or HTML via an uploaded file accessed with a dangerous extension such as .shtml at the end of the query string, in conjunction with a modified URI path that has a %2E sequence in place of the . (dot) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-1578 and CVE-2011-1587.
How severe is CVE-2011-1765?: CVE-2011-1765 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-1765 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1765?: CVE-2011-1765 primarily affects Mediawiki. In total, 137 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1765?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1765 published?: CVE-2011-1765 was published on 2011-05-23 and last updated on 2026-06-16.

References

Affected products (137)

cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.1.0:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.2:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.4:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.5:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.2.6:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.0:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.1:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.2:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.3:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.4:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.5:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.6:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.7:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.8:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.9:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.10:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.11:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.12:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.13:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.14:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.3.15:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta1:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta2:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta3:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta4:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta5:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4:beta6:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.3:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.4:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.5:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.6:*:*:*:*:*:*:*
cpe:2.3:a:mediawiki:mediawiki:1.4.7:*:*:*:*:*:*:*

More vulnerabilities in Mediawiki

CVE-2025-67484 — Critical (CVSS 9.8): Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files…
CVE-2024-34502 — Critical (CVSS 9.8): An issue was discovered in WikibaseLexeme in MediaWiki before 1.39.6, 1.40.x before 1.40.2, and 1.41.x before 1.41.1.…
CVE-2023-37303 — Critical (CVSS 9.8): An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to…
CVE-2023-29141 — Critical (CVSS 9.8): An issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6, and 1.39.x before 1.39.3. An…
CVE-2022-29906 — Critical (CVSS 9.8): The admin API module in the QuizGame extension for MediaWiki through 1.37.2 (before…
CVE-2022-29904 — Critical (CVSS 9.8): The SemanticDrilldown extension for MediaWiki through 1.37.2 (before e688bdba6434591b5dff689a45e4d53459954773) allows…

All CVEs affecting Mediawiki →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →