CVE-2026-123804

Description

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.

References

• https://github.com/supertokens/supertokens-core/commit/182b39454ac44649cdef22d87f296a38a0b1a602
• https://github.com/supertokens/supertokens-core/commit/378e1157dc26232a518d2c360ee60cf93c2fd8a2
• https://github.com/supertokens/supertokens-core/commit/5aec64aca6d765cde491658210e6922e291742fd
• https://github.com/supertokens/supertokens-core/commit/b1c569ed59fffe16c2f657da1754abcae47d2761
• https://github.com/supertokens/supertokens-core/commit/b44f1e1418206f411e541501c2e5b9b147add0d9