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Admidio CVE-2026-82658

| EUVDEUVD-2026-68244 MEDIUM
Improper Authorization (CWE-285)
2026-08-30 VulnCheck GHSA-7mr9-2w6x-hw8r
PHP Authentication Bypass Admidio
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/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
4.3 MEDIUM

Network-accessible endpoint, low complexity; PR:L because a valid account is required; confidentiality impact limited to membership metadata with no integrity or availability effect.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/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
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
CVE Published
Aug 31, 2026 - 10:50 cve.org
MEDIUM 5.3
Patch available
Aug 30, 2026 - 16:01 EUVD
Analysis Generated
Aug 30, 2026 - 15:07 vuln.today

DescriptionCVE.org

Admidio versions before 5.0.12 contain a broken access control vulnerability in profile_function.php that allows authenticated low-privilege users to read another user's future role memberships. Attackers can bypass profile-level authorization by directly calling the reload_future_memberships endpoint with a victim's user UUID to disclose sensitive membership information.

AnalysisAI

Broken access control in Admidio's profile_function.php allows any authenticated low-privilege user to enumerate another user's future role memberships by directly invoking the reload_future_memberships endpoint with a known victim UUID. Affected are all Admidio installations running versions prior to 5.0.12. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires an active authenticated session with at least a low-privilege Admidio account (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N) characterizes this as a low-complexity, network-reachable information disclosure requiring only a valid low-privilege account - consistent with the description's framing of an authenticated insider threat. … 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 Admidio to version 5.0.12 or later, which resolves the broken access control in profile_function.php. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-82658 vulnerability details – vuln.today
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