CVE-2026-111912 Admidio CVE debrief

Who should care

Defenders responsible for Admidio installations, particularly those with authenticated member access, should assess exposure and prioritize patching. Security teams monitoring for suspicious activity in Admidio forums should also be aware of this vulnerability.

Why it matters

CVE-2026-111912 is a high-severity vulnerability in Admidio that allows authenticated members to modify other users' forum topics. Defenders should prioritize patching, inventory checks, and monitoring for suspicious activity.

• Authenticated members can modify other users' forum topics, potentially leading to misinformation or further attacks
• Defenders need to verify and apply patches for Admidio versions 5.0.0 through 5.0.15
• Inventory checks are necessary to identify potentially vulnerable Admidio installations

Technical summary

The vulnerability exists in the ForumService::saveTopic() method of Admidio versions from 5.0.0 before 5.0.16. An attacker can manipulate the topic_uuid parameter in their own topic_save request, reusing their CSRF token, to overwrite the victim topic's title and first post. This insecure direct object reference vulnerability allows authenticated members to modify other users' forum topics. Defenders should prioritize verifying and applying the vendor-provided patch for Admidio versions 5.0.0 through 5.0.15. Inventory checks for Admidio installations and monitoring for suspicious topic modifications are recommended.

Defensive priority

Defenders should prioritize verifying and applying the vendor-provided patch for Admidio versions 5.0.0 through 5.0.15. Inventory checks for Admidio installations and monitoring for suspicious topic modifications are recommended.

Recommended defensive actions

• Verify and apply the vendor-provided patch for Admidio versions 5.0.0 through 5.0.15
• Conduct inventory checks for Admidio installations
• Monitor for suspicious topic modifications
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the insecure direct object reference vulnerability in Admidio. Vendor-provided advisories and patches are available for affected versions. The vulnerability exists in the ForumService::saveTopic() method of Admidio versions from 5.0.0 before 5.0.16. The CVE Program and NVD entries provide source-grounded information on the vulnerability. Defenders should verify and apply patches for Admidio versions 5.0.0 through 5.0.15.

Sources and 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.