CVE-2026-123802 SuperTokens Core is an open source authentication server.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123802?
CVE-2026-123802 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, a licensed deployment with a configured SAML client can authenticate an identity from an assertion that did not satisfy the audience check. When the identity provider uses assertion-level signing, an attacker who has a still-valid IdP-signed assertion naming the victim for any audience and the attacker's own valid assertion for the target audience can combine them because validateSamlResponseAudience accepts an audience from one assertion while extractAllClaims takes the final NameID and attributes from another; response-level signing does not expose this multi-assertion variant. Independently, an assertion from an identity provider configured for the target deployment but issued to another SuperTokens deployment using the shared default saml_sp_entity_id can satisfy the target's audience check. Successful exploitation authenticates the attacker as the victim IdP user. 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-2026-123802?
How do I fix CVE-2026-123802?
No fix has been published for CVE-2026-123802 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123802 being exploited?
There is no known exploitation of CVE-2026-123802 in the wild and no public exploit code.
Sources
Also known as GHSA-wfg2-vqfg-rqh6.