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CVE-2026-26000: XWiki Platform affected by click-jacking through CSS injection in comments

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-12 · updated 2026-06-17
• Weakness: CWE-1021

Description

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Prior to 17.9.0, 17.4.6, and 16.10.13, it's possible using comments to inject CSS that would transform the full wiki in a link area leading to a malicious page. This vulnerability is fixed in 17.9.0, 17.4.6, and 16.10.13.

Affected products

• xwiki-platform: before 16.10.13; from 17.0.0 before 17.4.6; from 17.5.0 before 17.9.0 — fixed in 16.10.13, 17.4.6, 17.9.0

How to fix

Upgrade to a fixed version: xwiki-platform 16.10.13, 17.4.6, 17.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/xwiki/xwiki-platform/releases/tag/xwiki-platform-17.4.6
• https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-74rh-c5rh-88vg

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