Y2Y2
Explore more on Y2
Public vulnerability disclosure
Investigate in Cyber
Open

CVE-2026-123804

SuperTokens Core: A session created concurrently with account unlink survives the unlink

publishedCWE-362CWE-613

SuperTokens Core is an open source authentication server. From 7.0.0 until 11.0.9, 11.1.4, 11.2.4, 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1, createNewSession can resolve a primary user before unlinkAccounts detaches a login method and then insert the session after unlink has enumerated and revoked the existing sessions. A user who controls the linked login method can exploit this race to retain a signed, database-backed, refreshable session as the former primary identity after that method is unlinked; the session persists until expiry or explicit revocation. This issue is fixed in versions 11.0.9, 11.1.4, 11.2.4, 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1.

Technical severity6.8 mediumCVSS 3.1 · CNA: GitHub_M
Published2026-11-09Source updated 2026-11-09
Collected2026-11-091 attributed source

Fixes and workarounds

No remediation reported in collected sources.

Missing remediation information is not evidence that no patch exists.

Affected products and versions

ProductVersionsAuthority
supertokens-core
supertokens 		>= 7.0.0, < 11.0.0 (affected)
>= 11.0.0, < 11.0.9 (affected)
>= 11.1.0, < 11.1.4 (affected)
>= 11.2.0, < 11.2.4 (affected)
>= 11.3.0, < 11.3.8 (affected)
>= 11.4.0, < 11.4.8 (affected)
>= 12.0.0, < 12.0.11 (affected)
>= 12.1.0, < 12.1.2 (affected)
>= 12.2.0, < 12.2.1 (affected)
>= 12.3.0, < 12.3.1 (affected) 		CNA: GitHub_M

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

Version / scoreVectorAuthority
3.1 / 6.8
medium		 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:NCNA: GitHub_M

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

For agents and automation

Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.

Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.

Get an API keyUse x402Connect an agent
Endpoints and access details

https://api.y2.dev/api/v2/cyber/cves
https://api.y2.dev/api/v2/cyber/cves/{cveId}

A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.

For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.

Agent access JSON · OpenAPI · CVE API guide