CVE-2026-41670Public exploitNetwork attack vector

Identity theft via unvalidated SAML response destination

Published May 7, 2026 · Updated May 7, 2026

Information disclosure in Admidio before 5.0.9 allows remote attackers to steal signed SAML assertions via crafted AuthnRequests. In SAMLService.php, handleSSORequest() copies the request's AssertionConsumerServiceURL into the response Destination and Recipient without comparing smc_acs_url. A logged-in user's browser must process the request, and knowing a registered SP Entity ID is sufficient when request signing is disabled by default.

CVSS severity8.2
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Admidio before 5.0.9 allows remote attackers to steal signed SAML assertions via crafted AuthnRequests. In SAMLService.php, handleSSORequest() copies the request's AssertionConsumerServiceURL into the response Destination and Recipient without comparing smc_acs_url. A logged-in user's browser must process the request, and knowing a registered SP Entity ID is sufficient when request signing is disabled by default.

The record

CVE
CVE-2026-41670
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Admidio
Product
Admidio
Classifications
CWE-20, CWE-601, T1528
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

8.2GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1528Steal Application Access Token

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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