CVE-2026-123801
SuperTokens Core: SAML callback accepts a replayed RelayState + SAMLResponse, minting a fresh authorization code on each replay
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.
INFO
Published Date :
Nov. 9, 2026, 7:16 p.m.
Last Modified :
Nov. 9, 2026, 7:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-123801
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update SuperTokens Core to version 11.3.8 or later.
- Apply patches for versions 11.4.8, 12.0.11, 12.1.2, 12.2.1, or 12.3.1.
- Ensure SAML callback validates Destination and Recipient.
- Enforce Response.InResponseTo check for SAML assertions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-123801.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-123801 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-123801
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-123801 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-123801 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Nov. 09, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-346 Added CWE CWE-384 Added CWE CWE-294 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/123xxx/CVE-2026-123801.json">CVE-2026-123801</a> Added Reference https://github.com/supertokens/supertokens-core/commit/075655222f5e72f3683a127e45c83c4174fbd4f7 Added Reference https://github.com/supertokens/supertokens-core/commit/4e05d8cf60287e9d2720140031a8b8f4430d056f Added Reference https://github.com/supertokens/supertokens-core/commit/557835406547d269f5d0e33159630a1873461c38 Added Reference https://github.com/supertokens/supertokens-core/commit/5c42f02e98f67174c6a5a800dd9f8bd5b6e98486 Added Reference https://github.com/supertokens/supertokens-core/commit/b6730e608b2d4562939cd4f41ea07df5f841dfe5 Added Reference https://github.com/supertokens/supertokens-core/commit/ca2bca9bc900c2fd399d508818ad026cc977dcf6 Added Reference https://github.com/supertokens/supertokens-core/releases/tag/v11.3.8 Added Reference https://github.com/supertokens/supertokens-core/releases/tag/v11.4.8 Added Reference https://github.com/supertokens/supertokens-core/releases/tag/v12.0.11 Added Reference https://github.com/supertokens/supertokens-core/releases/tag/v12.1.2 Added Reference https://github.com/supertokens/supertokens-core/releases/tag/v12.2.1 Added Reference https://github.com/supertokens/supertokens-core/releases/tag/v12.3.1 Added Reference https://github.com/supertokens/supertokens-core/security/advisories/GHSA-3r7x-rhvc-fw28