EEF-CVE-2026-81637
- Source
- https://cna.erlef.org/osv/EEF-CVE-2026-81637.html
- Import Source
- https://cna.erlef.org/osv/EEF-CVE-2026-81637.json
- JSON Data
- https://api.osv.dev/v1/vulns/EEF-CVE-2026-81637
- Aliases
-
- CVE-2026-81637
- GHSA-3vcj-gxx8-3p44
- Published
- 2026-09-17T13:09:06Z
- Modified
- 2026-09-17T13:26:03Z
- Severity
-
- 2.3 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Replayable OAuth2 CSRF state retained after a failed callback in AshAuthentication
- Details
-
Summary
Insufficient Session Expiration vulnerability in team-alembic AshAuthentication allows an attacker who obtains a victim's OAuth2
statevalue to replay the callback and sign that victim into an attacker-controlled account.AshAuthentication.Strategy.OAuth2.Plug.callback/2clears the storedsession_paramsthrough a rebinding step inside itswithchain,conn <- delete_session(conn, session_key). Elixir evaluates theelseblock in the scope enclosing thewith, so every failure path (the provider returning?error=access_denied, an invalid code, a token-exchange error, or a registration or sign-in failure) reachesstore_authentication_result/2holding the original connection and the session entry is never removed. The value the module's own comment describes as protection against a CSRF-related attack is therefore consumed only when authentication succeeds, and survives a cancelled or failed attempt until the next request phase or session expiry.This issue affects ash_authentication: from 0.6.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.
- Database specific
{ "capec_ids": [ "CAPEC-60" ], "cpe_ids": [ "cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*" ], "cwe_ids": [ "CWE-613" ] }- References
-
- https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-3vcj-gxx8-3p44
- https://cna.erlef.org/cves/CVE-2026-81637.html
- https://github.com/team-alembic/ash_authentication/commit/c5f589058e04239263f50a1430eb17ea6d5dd1a2
- https://github.com/team-alembic/ash_authentication/commit/bd4352303bc9d72d007f6818775267585a4bcc2f
- https://github.com/team-alembic/ash_authentication/commit/d7f939cd02bd618bcaa304631846fa75ffc419d7
- https://hex.pm/packages/ash_authentication
- Credits
-
-
- Peter Ullrich - REPORTER
-
- Jonatan Männchen / EEF - ANALYST
-
- James Harton - REMEDIATION_DEVELOPER
-
Affected packages
Hex / ash_authentication
Package
- Name
- ash_authentication
- Purl
- pkg:hex/ash_authentication
Affected ranges
- Type
- SEMVER
- Events
-
Introduced0.6.0Fixed4.15.0
- Type
- SEMVER
- Events
-
Introduced5.0.0-rc.0Fixed5.0.0-rc.14