CVE-2026-88952
- Source
- https://cve.org/CVERecord?id=CVE-2026-88952
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-88952.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-88952
- Aliases
-
- EEF-CVE-2026-88952
- GHSA-wc6x-276q-jrf9
- Published
- 2026-09-17T14:15:19Z
- Modified
- 2026-09-23T03:47:32Z
- Severity
-
- 9.1 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- OAuth2 sign-in attached to an existing account without an email comparison in AshAuthentication
- Details
-
Improper Authentication vulnerability in team-alembic AshAuthentication allows an attacker to be signed in as another user by linking an OAuth2 identity to an account that is not theirs.
AshAuthentication.Strategy.OAuth2.UserResolver.resolve/3 matches an existing account using the register action's upsert_identity keys, then gates linking the incoming provider identity to it on email_trusted?/2, which reads only the provider's email_verified boolean and never compares the provider's email value with the matched account's email. That gate assumes the account was matched by its email field, so under any other upsert_identity it is vacuous and an attacker presenting their own verified email is attached to, and issued a session for, an account matched on some other attribute. The same unguarded gate applies in OAuth2.SignInPreparation on the registration_enabled? false path, where the account is matched by the sign-in action's read filter instead. The upsert also rewrites the matched account's email to the attacker's address, so later account recovery reaches the attacker rather than the owner.
This issue affects ash_authentication: from 4.14.0 before 4.15.0 and from 5.0.0-rc.10 before 5.0.0-rc.14.
- Database specific
{ "cna_assigner": "EEF", "cwe_ids": [ "CWE-287" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88952.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "64530644f9b37ebb76ca14aeb83a77597a0034b7" }, { "fixed": "*" }, { "introduced": "42edcd8ebb13fafbb168f12591d7518ce0611fec" }, { "fixed": "*" } ], "source": "AFFECTED_FIELD" } ] }- References
-
- https://cna.erlef.org/cves/CVE-2026-88952.html
- https://github.com
- https://osv.dev/vulnerability/EEF-CVE-2026-88952
- https://repo.hex.pm
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88952.json
- https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-wc6x-276q-jrf9
- https://nvd.nist.gov/vuln/detail/CVE-2026-88952
- https://github.com/team-alembic/ash_authentication/commit/2bd630eef8b7c8ae1e90e8fd43ba12fbc7e256ba
- https://github.com/team-alembic/ash_authentication/commit/42edcd8ebb13fafbb168f12591d7518ce0611fec
- https://github.com/team-alembic/ash_authentication/commit/64530644f9b37ebb76ca14aeb83a77597a0034b7
- https://github.com/team-alembic/ash_authentication/commit/738bf9f32f2aa0d1bb92ce9ca5c2476cb5710459
- https://github.com/team-alembic/ash_authentication
Affected packages
Git / github.com/team-alembic/ash_authentication
Affected ranges
- Type
- GIT
- Repo
- https://github.com/team-alembic/ash_authentication
- Events
-
IntroducedFixedIntroducedFixedFixedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "4.14.0" }, { "fixed": "4.15.0" }, { "introduced": "5.0.0-rc.10" }, { "fixed": "5.0.0-rc.14" } ], "source": [ "DESCRIPTION", "REFERENCES" ] }