{"id":"CVE-2026-55789","title":"Logto is the modern, open-source auth infrastructure for SaaS and AI apps","summary":"Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's self-hosted SAML application IdP built the signed SAML response and assertion by string-substituting user-controlled profile attributes s…","severity":"high","cvss":8.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N","cwe":["CWE-91"],"published":"2026-07-10","updated":"2026-07-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55789","references":[{"url":"https://github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6","label":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/pull/9107","label":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/releases/tag/v1.41.0","label":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00402,"epssPercentile":0.3163,"ingestedAt":"2026-07-11T20:15:26.699Z","slug":"CVE-2026-55789","body":"## Overview\n\nLogto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's self-hosted SAML application IdP built the signed SAML response and assertion by string-substituting user-controlled profile attributes such as name, email, and custom attribute-mapping values into element-text placeholders of a SAML XML template using samlify 2.10.0, which left those placeholders unescaped. An authenticated low-privilege user could place XML markup in a profile attribute so Logto signed a forged SAML attribute, such as an arbitrary role, allowing privilege escalation at relying Service Providers that authorize on SAML attributes. This issue is fixed in version 1.41.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":46.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}