{"id":"CVE-2026-23478","summary":"Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback","details":"Cal.com is open-source scheduling software. From 3.1.6 to before 6.0.7, there is a vulnerability in a custom NextAuth JWT callback that allows attackers to gain full authenticated access to any user's account by supplying a target email address via session.update(). This vulnerability is fixed in 6.0.7.","aliases":["GHSA-7hg4-x4pr-3hrg"],"modified":"2026-08-27T03:57:06.364042075Z","published":"2026-01-13T21:37:35.541Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-602","CWE-639"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23478.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23478.json"},{"type":"ADVISORY","url":"https://github.com/calcom/cal.com/security/advisories/GHSA-7hg4-x4pr-3hrg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23478"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/calcom/cal.diy","events":[{"introduced":"a9344115d21010424e562509bc763d0b461dac29"},{"fixed":"0099c72f53957a1b65163f8176eeb718ad3664f8"}],"database_specific":{"source":["AFFECTED_FIELD","CPE_RANGE"],"cpe":"cpe:2.3:a:cal:cal.com:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"3.1.6"},{"fixed":"6.0.7"}]}}],"versions":["v6.0.6","v6.0.5","v6.0.4","v6.0.3","v6.0.2","v6.0.1","v6.0.0","v5.9.15","v5.9.14","v5.9.13","v5.9.12","v5.9.11","v5.9.10","v5.9.9","v5.9.8","v5.9.7","v5.9.6","v5.9.5","v5.9.4","v5.9.3","v5.9.2","v5.9.1","v5.9.0","v5.8.14","v5.8.13","v5.8.12","v5.8.11","v5.8.10","v5.8.9","v5.8.8","@calcom/atoms@1.12.1","v5.8.7","v5.8.6","v5.8.5","v5.8.4","v5.8.3","@calcom/atoms@1.11.0","v5.8.1","v5.8.0","v5.7.12","v5.7.11","v5.7.10","v5.7.8","v5.7.9","v5.7.7","v5.7.6","@calcom/atoms@1.10.0","v5.7.5","v5.7.4","v5.7.3","@calcom/atoms@1.9.0","v5.7.2","v5.7.1","v5.7.0","v5.6.20","v5.6.19","v5.6.18","v5.6.17","@calcom/atoms@1.8.0","v5.6.16","v5.6.15","@calcom/atoms@1.7.1","v5.6.14","v5.6.13","v5.6.12","@calcom/atoms@1.7.0","v5.6.11","v5.6.10","v5.6.9","v5.6.8","v5.6.7","v5.6.6","v5.6.5","@calcom/atoms@1.6.0","v5.6.4","v5.6.3","@calcom/atoms@1.5.0","v5.6.2","v5.6.1","v5.6.0","@calcom/atoms@1.4.0","v5.5.18","@calcom/atoms@1.3.1","@calcom/atoms@1.3.0","v5.5.17","v5.5.16","v5.5.15","v5.5.14","v5.5.13","v5.5.12","v5.5.11","@calcom/atoms@1.2.0","@calcom/atoms@1.1.2","v5.5.10","v5.5.9","v5.5.8","v5.5.7","v5.5.6","v5.5.5","v5.5.4","v5.5.3","v5.5.2","v5.5.1","v5.5.0","v5.4.20","@calcom/atoms@1.1.0","v5.4.19","v5.4.17","v5.4.16","v5.4.15","v5.4.14","v5.4.13","v5.4.12","v5.4.11","v5.4.10","@calcom/atoms@1.0.114","@calcom/atoms@1.0.112","@calcom/atoms@1.0.110","v5.4.9","v5.4.8","v5.4.7","v5.4.6","v5.4.5","v5.4.4","v5.4.3","v5.4.2","v5.4.1","v5.4.0","v5.3.13","v5.3.12","v5.3.11","v5.3.10","v5.3.9","v5.3.8","v5.3.7","v5.3.6","v5.3.5","v5.3.4","v5.3.3","v5.3.2","v5.3.1","v5.3.0","v5.2.17","v5.2.16","v5.2.15","v5.2.14","v5.2.13","v5.2.12","v5.2.10","v5.2.11","v5.2.9","v5.2.8","v5.2.7","v5.2.6","v5.2.5","v5.2.4","v5.2.3","v5.2.2","v5.2.1","v5.2.0","v5.1.21","v5.1.20","v5.1.19","v5.1.18","v5.1.17","v5.1.16","v5.1.15","v5.1.14","v5.1.13","v5.1.12","v5.1.11","v5.1.10","v5.1.9","v5.1.8","v5.1.7","v5.1.6","v5.1.5","v5.1.4","v5.1.3","v5.1.2","v5.1.1","v5.1.0","v5.0.20","v5.0.19","v5.0.18","v5.0.17","v5.0.15","v5.0.14","v5.0.13","v5.0.12","v5.0.11","v5.0.10","v5.0.9","v5.0.8","v5.0.6","v5.0.7","v5.0.5","v5.0.4","v5.0.3","v5.0.2","v5.0.1","v5.0.0","v4.9.13","v4.9.12","v4.9.11","v4.9.10","v4.9.9","v4.9.8","v4.9.7","v4.9.6","v4.9.5","v4.9.4","v4.9.3","v4.9.2","v4.9.1","v4.9.1-rc1","v4.9.0","v4.8.19","v4.8.18","v4.8.16","v4.8.15","v4.8.14","v4.8.13","v4.8.12","v4.8.11","v4.8.10","v4.8.9","v4.8.8","v4.8.7","v4.8.6","v4.8.5","v4.8.4","v4.8.3","v4.8.2","v4.8.1","v4.8.0","v4.7.25","v4.7.24","v4.7.23","v4.7.22","v4.7.21","v4.7.20","v4.7.19","v4.7.18","v4.7.17","v4.7.16","v4.7.15","v4.7.14","v4.7.13","v4.7.12","v4.7.11","v4.7.10","v4.7.9","v4.7.8","v4.7.7","v4.7.6","v4.7.5","v4.7.4","v4.7.3","v4.7.2","v4.7.1","v4.7.0","v4.6.24","v4.6.23","v4.6.22","v4.6.21","v4.6.20","v4.6.19","v4.6.18","v4.6.17","v4.6.16","v4.6.15","v4.6.14","v4.6.13","v4.6.12","v4.6.11","v4.6.10","v4.6.9","v4.6.8","v4.6.7","v4.6.6","v4.6.5","v4.6.4","v4.6.3","v4.6.2","v4.6.1","v4.6.0","v4.5.11","v4.5.10","v4.5.9","v4.5.8","v4.5.7","v4.5.6","v4.5.5","v4.5.4","v4.5.3","v4.5.2","v4.5.1","v4.5.0","v4.4.9","v4.4.8","v4.4.7","v4.4.6","v4.4.5","v4.4.4","v4.4.3","v4.4.2","v4.4.1","v4.4.0","v4.3.6","v4.3.5","v4.3.4","v4.3.3","v4.3.2","v4.3.1","v4.3.0","v4.2.5","v4.2.4","v4.2.3","v4.2.2","v4.2.1","v4.2.0","v4.1.12","v4.1.11","v4.1.10","v4.1.9","v4.1.8","v4.1.7","v4.1.6","v4.1.5","v4.1.4","v4.1.3","v4.1.2","v4.1.1","v4.1.0","v4.0.9","v4.0.8","v4.0.7","v4.0.6","v4.0.5","v4.0.4","v4.0.3","v4.0.2","v4.0.1","v4.0.0","v3.9.9","v3.9.8","v3.9.7","v3.9.6","v3.9.5","v3.9.4","v3.9.3","v3.9.2","v3.9.1","v3.9.0","v3.8.9","v3.8.8","v3.8.7","v3.8.6","v3.8.5","v3.8.4","v3.8.3","v3.8.2","v3.8.1","v3.8.0","v3.8.0-rc1","v3.7.19","v3.7.18","v3.7.17","v3.7.16","v3.7.15","v3.7.14","v3.7.13","v3.7.12","v3.7.11","v3.7.10","v3.7.9","v3.7.8","v3.7.7","v3.7.6","v3.7.5","v3.7.4","v3.7.3","v3.7.2","v3.7.1","v3.7.0","v3.6.4","v3.6.3","v3.6.2","v3.6.1","v3.6.0","v3.5.5","v3.5.4","v3.5.3","v3.5.2","v3.5.1","v3.5.0","v3.4.10","v3.4.9","v3.4.8","v3.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