CVE-2026-123798
Received Received - Intake

XML Signature Wrapping in SuperTokens Core

Publication date: 2026-11-09

Last updated on: 2026-11-09

Assigner: GitHub, Inc.

Description
SuperTokens 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.

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Meta Information

Published
2026-11-09
Last Modified
2026-11-09
Generated
2026-11-09
AI Q&A
2026-11-09
EPSS Evaluated
N/A
NVD
CVE-2026-123798
EUVD
EUVD-2026-120162

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
supertokens core to 11.3.7 (inc)
supertokens core 11.4.7
supertokens core 12.0.10

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

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Executive Summary

This vulnerability in SuperTokens Core allows an attacker to bypass authentication by manipulating XML signatures. The issue occurs because the system does not validate the structure of signed elements before processing them. An attacker can move a valid signed element elsewhere in the document while replacing the actual user identity with their own, tricking the system into authenticating them as another user.

Impact Analysis

If exploited, this vulnerability could allow an unauthorized user to impersonate another user, gaining access to sensitive data or performing actions on their behalf. This could lead to data breaches, unauthorized transactions, or other malicious activities depending on the system's configuration.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR's data protection principles and HIPAA's security requirements. Non-compliance may result in legal penalties, reputational damage, and loss of trust in the affected system.

Mitigation Strategies

Upgrade SuperTokens Core to version 11.3.7, 11.4.7, or 12.0.10 or later to address the vulnerability.

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