What’s Vulnerable › Vulnerabilities

CVE-2025-62670: Stored XSS through a system message in FlexDiagrams

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-18 · updated 2026-10-09
• Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation Mediawiki - FlexDiagrams Extension allows Stored XSS.This issue affects Mediawiki - FlexDiagrams Extension: master.

Affected products

• The Wikimedia Foundation Mediawiki - FlexDiagrams Extension: master

References

• https://gerrit.wikimedia.org/r/c/mediawiki/extensions/FlexDiagrams/+/1179692
• https://phabricator.wikimedia.org/T402149
• https://phabricator.wikimedia.org/T402149

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