{"id":25330,"date":"2026-09-18T00:32:25","date_gmt":"2026-09-17T16:32:25","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-78223"},"modified":"2026-09-18T00:32:25","modified_gmt":"2026-09-17T16:32:25","slug":"cve-2026-78223","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-78223","title":{"rendered":"CVE-2026-78223 &#8211; Improper Verification of Cryptographic Signature vulnerability in team-alembic AshAuthenti"},"content":{"rendered":"<p>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.<\/p>\n<p>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) &gt; 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.<\/p>\n<p>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.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>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 <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25330","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25330","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25330"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}