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PatchSiren cyber security CVE debrief

CVE-2026-26477 DokuWiki CVE debrief

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 affects Dokuwiki users, and its impact is limited to denial of service attacks. The CVSS score is 4.3, and the CVSS severity is MEDIUM.

Vendor
DokuWiki
Product
Unknown
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-03
Original CVE updated
2026-07-24
Advisory published
2026-04-03
Advisory updated
2026-07-24

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26477 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26477

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-26477 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26477

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.