{"id":"CVE-2026-62317","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 email subaddressing blocklist in packages/core/src/libraries/sign-in-experience/email-blocklist-policy.ts used the attacker-controlled do…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-1333"],"published":"2026-08-19","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:15:59.613","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-62317","references":[{"url":"https://github.com/logto-io/logto/commit/021381237511bc0d42f81d65df8b036b01f40547","label":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/pull/9106","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-qp7j-c3q2-g739","label":"security-advisories@github.com"},{"url":"https://github.com/logto-io/logto/security/advisories/GHSA-qp7j-c3q2-g739","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00631,"epssPercentile":0.48553,"ingestedAt":"2026-09-09T21:22:45.543Z","slug":"CVE-2026-62317","body":"## Overview\n\nLogto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's email subaddressing blocklist in packages/core/src/libraries/sign-in-experience/email-blocklist-policy.ts used the attacker-controlled domain from email input to construct subaddressingRegex when blockSubaddressing was enabled. The permissive emailRegEx accepted multiple at signs and regular expression metacharacters, and POST /api/experience/verification/verification-code could therefore cause catastrophic backtracking in subaddressingRegex.test(email). The resulting event-loop stall could make authentication, token issuance, SSO, and the administrative console unavailable. 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":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}