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Admidio CVE-2026-82657

| EUVDEUVD-2026-68243 HIGH
Information Exposure (CWE-200)
2026-08-30 VulnCheck GHSA-w236-q4gr-7x7m
PHP Information Disclosure Admidio
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

Network-accessible endpoints require no privileges or interaction; confidentiality is high as full post content is exposed, with no integrity or availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
CVE Published
Aug 31, 2026 - 10:50 cve.org
HIGH 8.7
Patch available
Aug 30, 2026 - 16:01 EUVD
Analysis Generated
Aug 30, 2026 - 15:04 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Unauthenticated information disclosure in Admidio before 5.0.12 exposes private forum and announcement content through unprotected RSS feed endpoints. Remote attackers with no credentials can retrieve full post text, titles, author names, and timestamps from modules explicitly configured as login-only, bypassing the intended access restriction entirely. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target Admidio instance has the forum or announcements module configured with login-only (restricted) access - if those modules are intentionally public, the vulnerability has no additional impact beyond the existing access level. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 accurately reflects the attack profile: network-reachable with zero complexity, no privileges, and no user interaction required, resulting in high confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to Admidio 5.0.12 or later, which enforces authentication checks on the RSS feed endpoints for the forum and announcements modules. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-82657 vulnerability details – vuln.today
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