EEF-CVE-2026-80218
- Source
- https://cna.erlef.org/osv/EEF-CVE-2026-80218.html
- Import Source
- https://cna.erlef.org/osv/EEF-CVE-2026-80218.json
- JSON Data
- https://api.osv.dev/v1/vulns/EEF-CVE-2026-80218
- Aliases
-
- CVE-2026-80218
- GHSA-3pr8-f99q-86hp
- Published
- 2026-09-17T13:09:25Z
- Modified
- 2026-09-17T13:26:03Z
- Severity
-
- 7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Sign-in token minted for one resource accepted by another in AshAuthentication
- Details
-
Summary
Improper Authentication vulnerability in team-alembic AshAuthentication allows an attacker holding a sign-in token for one authenticated resource to be signed in as a user of a different resource.
AshAuthentication.Strategy.Password.SignInWithTokenPreparation.extract_primary_keys_from_subject/2parses the JWTsubclaim (for exampleuser?id=1) withURI.parse/1and keeps only its query string, discarding the path segment that names the subject the token was issued for. Nothing else restores that binding:AshAuthentication.Jwt.verify/3checks the signature,exp,nbf,jtiand the library-version claims, the purpose check only requiressign_in, and the remaining comparison is over primary-key field names, which are identical across resources. The WebAuthn sign-in and remember-me preparations carry copies of the same helper and drop the path in the same way. The magic link sign-in path pins the subject name against the resource and is not affected.This issue affects ash_authentication: from 3.10.5 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.
- Database specific
{ "capec_ids": [ "CAPEC-151" ], "cpe_ids": [ "cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:*" ], "cwe_ids": [ "CWE-287" ] }- References
-
- https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-3pr8-f99q-86hp
- https://cna.erlef.org/cves/CVE-2026-80218.html
- https://github.com/team-alembic/ash_authentication/commit/eca8cadea0f1595ed2c10a0c177b1da9aa9e5269
- https://github.com/team-alembic/ash_authentication/commit/2640e1872e1fef4e4606e601bf00102cff784c03
- https://github.com/team-alembic/ash_authentication/commit/7baac243ca651eee127a84d672eee3fcff42e598
- 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
-
Introduced3.10.5Fixed4.15.0
- Type
- SEMVER
- Events
-
Introduced5.0.0-rc.0Fixed5.0.0-rc.14