CVE-2026-123801 SuperTokens Core is an open source authentication server.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123801?
CVE-2026-123801 is a high-severity vulnerability in supertokens-core, published on 9 Nov 2026.
Official description
SuperTokens Core is an open source authentication server. From 11.3.0 until 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1, SAML.handleCallback does not consume RelayState, record assertion identifiers, or enforce Response.InResponseTo. In the SP-initiated flow, an attacker who obtains a legitimately issued, still-valid SAML response and its matching RelayState can resubmit the pair to /recipe/saml/callback before the assertion's NotOnOrAfter time; in the IdP-initiated flow, the assertion can be replayed without RelayState. The missing Response.InResponseTo check also permits an in-progress login to be completed with an assertion for a different identity and fails to enforce allowIDPInitiatedLogin=false. The callback does not validate Destination or SubjectConfirmationData Recipient and NotOnOrAfter, and each accepted callback mints a fresh, independently redeemable authorization code carrying the captured user's identity. This issue is fixed in versions 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1.
Which versions are affected by CVE-2026-123801?
How do I fix CVE-2026-123801?
No fix has been published for CVE-2026-123801 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123801 being exploited?
There is no known exploitation of CVE-2026-123801 in the wild and no public exploit code.
Sources
Also known as GHSA-3r7x-rhvc-fw28.