Wikimedia Foundation has 8 CVEs on record. Disclosure cadence is accelerating: 8 in the last 90 days against 0 in the 90 before. The busiest recent month was September 2026 with 8. The median CVSS is 5.3 (medium), with 1 rated critical. None have a confirmed exploitation report. The most common weakness class is CWE-79 (4). Most affected products: Mediawiki - WikiLambda Extension (2), Mediawiki - ExternalData Extension (1), Mediawiki - TemplateSandbox Extension (1).
CVEs per month
Last 12 months, by publish date
- Exploited share
- 0% vs 1% corpus
- Median CVSS
- 5.3
- Publish → KEV
- —
- Last 90 days
- 8 prev 0
Products
- Mediawiki - WikiLambda Extension 2
- Mediawiki - ExternalData Extension 1
- Mediawiki - TemplateSandbox Extension 1
- Mediawiki - Translate Extension 1
- Mediawiki - UploadWizard Extension 1
- Mediawiki - Wikibase Extension 1
Worst active — by depth score
CVE-2026-100382Critical· 10.0Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Wikimedia Foundation Mediawiki - ExternalData Extension allows OS Command Injection. This issue affects Mediawiki - ExternalData…55CVE-2026-100377Medium· 6.9Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Excavation. This issue affects Mediawiki - WikiLambda Extension: 1.47.0-alpha38CVE-2026-100381Medium· 5.3Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - UploadWizard Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - Uploa…29CVE-2026-100380Medium· 5.3Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Wikibase Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - Wikibase …29CVE-2026-100379Medium· 5.3Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Wikipedia Android App allows Accessing/Intercepting/Modifying HTTP Cookies. This issue affects Wikipedia Android App: main.29
Wikimedia Foundation vulnerabilities
CVEs affecting Wikimedia Foundation, newest first. Open any entry for full detail, references, and exploit status.
8 CVEsRSS
CVE-2026-100383Medium· 4.8Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - WikiLam…
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - WikiLam…
CVE-2026-100381Medium· 5.3Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - UploadWizard Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - Uploa…
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - UploadWizard Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - Uploa…
CVE-2026-100382Critical· 10.0Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Wikimedia Foundation Mediawiki - ExternalData Extension allows OS Command Injection. This issue affects Mediawiki - ExternalData…
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Wikimedia Foundation Mediawiki - ExternalData Extension allows OS Command Injection. This issue affects Mediawiki - ExternalData…
CVE-2026-100380Medium· 5.3Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Wikibase Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - Wikibase …
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Wikibase Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - Wikibase …
CVE-2026-100379Medium· 5.3Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Wikipedia Android App allows Accessing/Intercepting/Modifying HTTP Cookies. This issue affects Wikipedia Android App: main.
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Wikipedia Android App allows Accessing/Intercepting/Modifying HTTP Cookies. This issue affects Wikipedia Android App: main.
CVE-2026-100378Medium· 5.3Missing Authorization vulnerability in Wikimedia Foundation Mediawiki - Translate Extension allows Accessing Functionality Not Properly Constrained by ACLs. This issue affects Mediawiki - Translate Extension: from * before 1.46.1, 1.45.…
Missing Authorization vulnerability in Wikimedia Foundation Mediawiki - Translate Extension allows Accessing Functionality Not Properly Constrained by ACLs. This issue affects Mediawiki - Translate Extension: from * before 1.46.1, 1.45.…
CVE-2026-100377Medium· 6.9Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Excavation. This issue affects Mediawiki - WikiLambda Extension: 1.47.0-alpha
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Excavation. This issue affects Mediawiki - WikiLambda Extension: 1.47.0-alpha. The issue has been r…
CVE-2026-100376Medium· 4.8Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - TemplateSandbox Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - Te…
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - TemplateSandbox Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - Te…