SuperTokens Core: SAML XML Signature Wrapping authentication bypass — any IdP user can authenticate as any other user

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-123798
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 11.3.7, 11.4.7, and 12.0.10, SAML.verifySamlResponseSignature calls OpenSAML SignatureValidator.validate without first applying SAMLSignatureProfileValidator. The Core can therefore accept a cryptographically valid signature that references a different XML element from the Response or Assertion whose NameID and attributes are used for authentication. An ordinary user of the configured identity provider can move a genuinely signed element elsewhere in the document while supplying an attacker-authored identity-bearing element, causing XML Signature Wrapping authentication as another IdP user. Both response-level and assertion-level signing paths are affected, and SP-initiated login remains reachable without enabling allowIDPInitiatedLogin. This issue is fixed in versions 11.3.7, 11.4.7, and 12.0.10.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

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

Problem Types: CWE-287 | CWE-347 | CWE-287 CWE-287: Improper Authentication | CWE-347 CWE-347: Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Supertokens Supertokens-core affected >= 12.0.6, < 12.0.10 Not specified
CNA Supertokens Supertokens-core affected >= 11.4.0, < 11.4.7 Not specified
CNA Supertokens Supertokens-core affected >= 11.3.0, < 11.3.7 Not specified

References

ReferenceSourceLinkTags
github.com/supertokens/supertokens-core/security/advisories/GHSA-gvx2-mw... [email protected] github.com
github.com/supertokens/supertokens-core/commit/9cba541ae2ed87b878d11b257... [email protected] github.com
github.com/supertokens/supertokens-core/commit/d0773f2a6497411aeda5d4f03... [email protected] github.com
github.com/supertokens/supertokens-core/commit/8d06b0cfb5409c5bf505051dd... [email protected] github.com
github.com/supertokens/supertokens-core/releases/tag/v11.3.7 [email protected] github.com
github.com/supertokens/supertokens-core/releases/tag/v11.4.7 [email protected] github.com
github.com/supertokens/supertokens-core/releases/tag/v12.0.10 [email protected] github.com
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