CVE-2026-26477 DokuWiki CVE debrief

Who should care

Users of Dokuwiki v.2025-05-14b 'Librarian' [56.2] should apply the vendor remediation to prevent denial of service attacks. Dokuwiki administrators and security teams should review the vulnerability and implement compensating controls if necessary.

Technical summary

CVE-2026-26477 is a denial of service vulnerability in Dokuwiki v.2025-05-14b 'Librarian' [56.2]. The issue is caused by the media_upload_xhr() function in the media.php file. A remote attacker can exploit this vulnerability to cause a denial of service. The vulnerability is a result of insufficient input validation in the media_upload_xhr() function. The CVSS score is 4.3, and the CVSS severity is MEDIUM.

Defensive priority

Apply vendor remediation to prevent denial of service attacks. Review compensating controls for exposed systems while remediation is scheduled and verified.

Recommended defensive actions

• Apply the vendor remediation
• Inventory and verify Dokuwiki v.2025-05-14b 'Librarian' [56.2] installations
• Monitor for suspicious activity
• Implement compensating controls
• Exception tracking and retest
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-04-03T15:16:05.093Z and was last modified on 2026-07-24T21:10:00.143Z. The NVD entry is currently Analyzed. The evidence is limited, and defenders should verify the affected scope and vendor guidance. The CVE record is based on the supplied source corpus, and its accuracy is dependent on the source information.

Official resources