CVE-2026-78223
- Source
- https://cve.org/CVERecord?id=CVE-2026-78223
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-78223.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-78223
- Aliases
-
- EEF-CVE-2026-78223
- GHSA-mfwg-5cpf-px58
- Published
- 2026-09-17T13:09:19Z
- Modified
- 2026-09-20T11:30:18Z
- Severity
-
- 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Token revocation record built from unverified JWT claims in AshAuthentication
- Details
-
Improper Verification of Cryptographic Signature vulnerability in team-alembic AshAuthentication allows a caller of the token revocation action to neutralise a revocation or write arbitrary rows into the token resource.
AshAuthentication.TokenResource.RevokeTokenChange.change/3 reads the :token argument and decodes it with AshAuthentication.Jwt.peek/1, which delegates to Joken.peek_claims/1 and performs no signature check, unlike Jwt.verify/4. The jti, exp and sub claims it returns are written straight onto the revocation record, guarded only by byte_size(token) > 0. Because expires_at derives from the attacker-chosen exp, a forged copy of a genuine token that keeps the real jti but backdates exp yields a revocation row that is already expired: expunge_expired removes it and the genuine token passes revoked? again. Arbitrary jti and sub values can be inserted the same way.
This issue affects ash_authentication: from 0.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.
- Database specific
{ "cna_assigner": "EEF", "cwe_ids": [ "CWE-347" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78223.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "a939dde9b917c072cdf10c4b0913a9886a4b0231" }, { "fixed": "*" } ], "source": "AFFECTED_FIELD" } ] }- References
-
- https://cna.erlef.org/cves/CVE-2026-78223.html
- https://github.com
- https://osv.dev/vulnerability/EEF-CVE-2026-78223
- https://repo.hex.pm
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78223.json
- https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-mfwg-5cpf-px58
- https://nvd.nist.gov/vuln/detail/CVE-2026-78223
- https://github.com/team-alembic/ash_authentication/commit/344cebb12faf68e648d3283394073ba0c0f78459
- https://github.com/team-alembic/ash_authentication/commit/a939dde9b917c072cdf10c4b0913a9886a4b0231
- https://github.com/team-alembic/ash_authentication/commit/eb86353fe5a547c5ff5fd9af0e2c212518c31c9b
- 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
-
IntroducedFixedIntroducedFixedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "introduced": "0.2.0" }, { "fixed": "4.15.0" }, { "introduced": "5.0.0-rc.0" }, { "fixed": "5.0.0-rc.14" } ], "source": [ "DESCRIPTION", "REFERENCES" ] }