CVE-2026-9098Network attack vector

Authentication bypass via uncorrelated SAML responses

Published May 28, 2026 · Updated May 28, 2026

Authentication bypass in Casdoor 2.362.0 and earlier allows remote attackers controlling a registered IdP to obtain unauthorized sessions. The /api/acs handler in controllers/auth.go accepts a SAMLResponse without correlating it to a Casdoor-issued AuthnRequest and retains a stale provider snapshot. Unsolicited or replayed responses remain usable across sessions or after the SAML flow ends, enabling persistent user impersonation.

CVSS severity9.1
Critical
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Casdoor 2.362.0 and earlier allows remote attackers controlling a registered IdP to obtain unauthorized sessions. The /api/acs handler in controllers/auth.go accepts a SAMLResponse without correlating it to a Casdoor-issued AuthnRequest and retains a stale provider snapshot. Unsolicited or replayed responses remain usable across sessions or after the SAML flow ends, enabling persistent user impersonation.

The record

CVE
CVE-2026-9098
Published
May 28, 2026
Updated
May 28, 2026
Vendor
Casdoor
Product
Casdoor
Classifications
CWE-488, T1606.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=0 <=2.362.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Casdoor · Casdoorversion=0 <=2.362.0

Published CVSS scores

9.1GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-488Exposure of Data Element to Wrong Session
T1606.002Forge Web Credentials: SAML Tokens

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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