SuperTokens Core: SAML callback accepts a replayed RelayState + SAMLResponse, minting a fresh authorization code on each replay

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-123801
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-09 19:16:46 UTC
Updated2026-11-09 19:16:46 UTC
DescriptionSuperTokens 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-294 | CWE-346 | CWE-384 | CWE-294 CWE-294: Authentication Bypass by Capture-replay | CWE-346 CWE-346: Origin Validation Error | CWE-384 CWE-384: Session Fixation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Supertokens Supertokens-core affected >= 11.3.0, < 11.3.8 Not specified
CNA Supertokens Supertokens-core affected >= 11.4.0, < 11.4.8 Not specified
CNA Supertokens Supertokens-core affected >= 12.0.0, < 12.0.11 Not specified
CNA Supertokens Supertokens-core affected >= 12.1.0, < 12.1.2 Not specified
CNA Supertokens Supertokens-core affected >= 12.2.0, < 12.2.1 Not specified
CNA Supertokens Supertokens-core affected >= 12.3.0, < 12.3.1 Not specified

References

ReferenceSourceLinkTags
github.com/supertokens/supertokens-core/releases/tag/v12.2.1 [email protected] github.com
github.com/supertokens/supertokens-core/security/advisories/GHSA-3r7x-rh... [email protected] github.com
github.com/supertokens/supertokens-core/releases/tag/v12.3.1 [email protected] github.com
github.com/supertokens/supertokens-core/releases/tag/v12.0.11 [email protected] github.com
github.com/supertokens/supertokens-core/commit/ca2bca9bc900c2fd399d50881... [email protected] github.com
github.com/supertokens/supertokens-core/commit/075655222f5e72f3683a127e4... [email protected] github.com
github.com/supertokens/supertokens-core/commit/5c42f02e98f67174c6a5a800d... [email protected] github.com
github.com/supertokens/supertokens-core/commit/557835406547d269f5d0e3315... [email protected] github.com
github.com/supertokens/supertokens-core/releases/tag/v11.4.8 [email protected] github.com
github.com/supertokens/supertokens-core/releases/tag/v11.3.8 [email protected] github.com
github.com/supertokens/supertokens-core/commit/4e05d8cf60287e9d272014003... [email protected] github.com
github.com/supertokens/supertokens-core/releases/tag/v12.1.2 [email protected] github.com
github.com/supertokens/supertokens-core/commit/b6730e608b2d4562939cd4f41... [email protected] github.com
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