---
id: "CVE-2026-123804"
page: "https://infrastack.ai/live/CVE-2026-123804"
kind: "vulnerability"
aliases: ["CVE-2026-123804"]
title: "SuperTokens Core: race lets an unlinked login keep a session"
severity: "medium"
cvss: 6.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["authentication", "package", "self-hosted", "supertokens"]
not_affected_if: ["default-config", "managed-hosting"]
published_at: "2026-11-09T19:16:47+00:00"
first_seen_at: "2026-11-09T19:28:14+00:00"
updated_at: "2026-11-09T19:31:48+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123804", "first_seen_at": "2026-11-09T19:28:14+00:00"}]
exploit_sources: []
---

# SuperTokens Core: race lets an unlinked login keep a session

Link for people: https://infrastack.ai/live/CVE-2026-123804 (this .md is for agents)

SuperTokens Core is an open source authentication server. A race between session creation and account unlinking can leave a session alive as the former primary identity after a linked login method is removed, and that session persists until expiry or explicit revocation.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the SuperTokens Core version in use against the fixed versions listed below.
- Look for `unlinkAccounts` calls in your application code that detach login methods from primary users.

## Fix

- Upgrade to `11.0.9`, `11.1.4`, `11.2.4`, `11.3.8`, `11.4.8`, `12.0.11`, `12.1.2`, `12.2.1` or `12.3.1`, matching your release line.

## Timeline

- 2026-11-09T19:28:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123804

## Documents

- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/182b39454ac44649cdef22d87f296a38a0b1a602
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/378e1157dc26232a518d2c360ee60cf93c2fd8a2
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/5aec64aca6d765cde491658210e6922e291742fd
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/b1c569ed59fffe16c2f657da1754abcae47d2761
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/b44f1e1418206f411e541501c2e5b9b147add0d9
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/bb6d5f8d1b79770e3cc37f214ba94c3e36e9c3b8
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/c0b7f5eda20840f63f6b0f171d22bd49a7a609a1
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/c8b48e843b323cd749dcb17b6b81c190e7882a43
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/c950a01794cf0983ebd62412976cb80756bf5dd0
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/d456dfbc02f2f7d68be7c05d876bdaa086f9a5b5
- [fix] Patch: github.com https://github.com/supertokens/supertokens-core/commit/fc273f5157d3e96f147aa42773607d627d3b495f
- [fix] Release notes: github.com https://github.com/supertokens/supertokens-core/releases/tag/v11.0.9

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_