Casdoor up to 2.362.0 object/saml_sp.go ParseSamlResponse authentication replay

Summaryinfo

A vulnerability was found in Casdoor up to 2.362.0. It has been classified as problematic. Affected is the function ParseSamlResponse of the file object/saml_sp.go. This manipulation causes authentication replay. This vulnerability is registered as CVE-2026-9095. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in Casdoor up to 2.362.0. Affected by this vulnerability is the function ParseSamlResponse of the file object/saml_sp.go. The manipulation with an unknown input leads to a authentication replay vulnerability. The CWE definition for the vulnerability is CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). As an impact it is known to affect integrity. The summary by CVE is:

Casdoor versions 2.362.0 and earlier map SAML assertions to user sessions without replay protection. The ParseSamlResponse() function in object/saml_sp.go calls sp.RetrieveAssertionInfo() and immediately maps the result to a user session. There is no assertion ID cache, OneTimeUse condition enforcement, or replay detection anywhere in the SAML SP code path. As a result, an attacker can replay a previously captured SAML assertion to obtain an authenticated session for the assertion’s subject, including administrator accounts, without needing the user’s password or MFA credentials.

The advisory is shared at kb.cert.org. This vulnerability is known as CVE-2026-9095 since 05/20/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/28/2026). MITRE ATT&CK project uses the attack technique T1040 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• Casdoor

Version

• 2.362

CPE 2.3info

• 🔒

CPE 2.2info

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