{"id":"CVE-2026-104056","title":"Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding","summary":"Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding. This allows a poisoned discovery response to replace all endpoint values with attacker-controll…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-345","CWE-346","CWE-829"],"vendor":"Authlib","product":"Authlib","affected":["Authlib 1.7.2"],"published":"2026-10-01","updated":"2026-10-05","sourceUpdated":"2026-10-05T19:17:14.327","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-104056","references":[{"url":"https://uziii2208.github.io/post/cve-2026-104056/","label":"cret@cert.org"},{"url":"https://uziii2208.github.io/post/cve-2026-104056/","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-104056.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-104056"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2544875"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-104056"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104056"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat","score-dispute"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-05T18:21:10.671606Z"},"epss":0.002,"epssPercentile":0.09833,"scores":{"nvd":9.8,"vendor":5.9,"adp":9.8},"ingestedAt":"2026-10-01T18:55:42.396Z","slug":"CVE-2026-104056","body":"## Overview\n\nAuthlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding. This allows a poisoned discovery response to replace all endpoint values with attacker-controlled values rather than endpoint URLs that share the origin of the configured server metadata URL.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Exploit Intelligence, Lightspeed Core, Migration Toolkit for Applications 8, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux command line assistant, … · no fix planned: Exploit Intelligence, Red Hat Quay 3, Lightspeed Core, Migration Toolkit for Applications 8, … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-104056.json)","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":215984,"id":"CVE-2026-104056","ts":1791228725746,"field":"cvss","old":"5.9","new":"9.8"},{"seq":215983,"id":"CVE-2026-104056","ts":1791228725746,"field":"severity","old":"medium","new":"critical"},{"seq":215972,"id":"CVE-2026-104056","ts":1791225042248,"field":"exploit_available","old":"false","new":"true"},{"seq":214810,"id":"CVE-2026-104056","ts":1790927893254,"field":"cvss","old":null,"new":"5.9"},{"seq":214809,"id":"CVE-2026-104056","ts":1790927893254,"field":"severity","old":"none","new":"medium"}]}