CVE-2026-82657: Admidio before 5.0.12 Authentication Bypass via RSS feeds

Severity: high (CVSS 7.5 v3.1)
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: 2026-08-30 · updated 2026-08-31
Weakness: CWE-200

Description

Admidio before 5.0.12 fails to enforce login-only module restrictions in RSS feed endpoints for forum and announcements modules. Unauthenticated attackers can retrieve forum topics and announcements by sending GET requests to rss/forum.php or rss/announcements.php, disclosing titles, full post text, author names, and timestamps.

Affected products

admidio: before 5.0.12 — fixed in 5.0.12

How to fix

Upgrade to a fixed version: admidio 5.0.12. Check the vendor advisory for mitigations.

References

https://github.com/Admidio/admidio/security/advisories/GHSA-mg9h-42f8-2pmm
https://www.vulncheck.com/advisories/admidio-before-5.0.12-authentication-bypass-via-rss-feeds
https://github.com/Admidio/admidio/security/advisories/GHSA-mg9h-42f8-2pmm

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