CVE-2026-41669Public exploitNetwork attack vector

Attribute disclosure and session termination via ignored validation

Published May 7, 2026 · Updated May 7, 2026

Improper SAML signature verification in Admidio before 5.0.9 allows remote attackers to process forged authentication and logout requests. SAMLService::handleSSORequest and handleSLORequest discard failure strings from validateSignature, so execution continues as though validation succeeded. When SAML and signature enforcement are configured, forged requests can disclose a logged-in user's attributes or terminate a user's session.

CVSS severity8.2
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper SAML signature verification in Admidio before 5.0.9 allows remote attackers to process forged authentication and logout requests. SAMLService::handleSSORequest and handleSLORequest discard failure strings from validateSignature, so execution continues as though validation succeeded. When SAML and signature enforcement are configured, forged requests can disclose a logged-in user's attributes or terminate a user's session.

The record

CVE
CVE-2026-41669
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Admidio
Product
Admidio
Classifications
CWE-347, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.0.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Admidio · Admidioversion=< 5.0.9

Published CVSS scores

8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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