# CVE-2026-9095: Casdoor SAML assertion replay vulnerability

Source: https://junglewise.ai/threats/cve-2026-9095-casdoor-saml-assertion-replay-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-28. Updated: 2026-05-28  
License: CC BY 4.0 with a link back

CVE-2026-9095 · Severity: info · CVSS 9.8 · Published 2026-05-28

Casdoor, an identity and access management platform, contains a security flaw in how it handles login requests from external identity providers. Because the system does not check if a login credential has been used before, an attacker who captures a previous login session can reuse it to gain unauthorized access. This allows an attacker to log in as any user, including administrators, without needing a password or multi-factor authentication.

## Quick answers

**Is CVE-2026-9095 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9095 being exploited in the wild.

**How severe is CVE-2026-9095?** Informational severity, with a CVSS score of 9.8, published 28 May 2026.

**Which products and versions are affected?** Casdoor Casdoor 2.362.0 and earlier.

**Is there a fix for CVE-2026-9095?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-9095 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9095?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability in Casdoor's SAML Service Provider (SP) implementation arises from a lack of replay protection in the ParseSamlResponse() function within object/saml_sp.go. The application fails to maintain an assertion ID cache or enforce 'OneTimeUse' conditions, meaning it does not track whether a specific SAML assertion has already been processed. An attacker can capture a valid SAML assertion and replay it to the Assertion Consumer Service (ACS) endpoint to establish a new authenticated session. This bypasses all authentication requirements, including passwords and MFA, and can be used to impersonate any subject in the assertion, including administrative accounts. As of the advisory date, no patch is available.

## Affected products

- Casdoor Casdoor 2.362.0 and earlier

## Timeline

- 2026-05-28: disclosed: Vulnerability disclosed by CERT/CC after unsuccessful coordination with the vendor.
- 2026-05-28: advisory: NVD published CVE-2026-9095.

## References

- [https://kb.cert.org/vuls/id/780781](https://kb.cert.org/vuls/id/780781)