{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-23478 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-23478 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-23478 is a critical authentication bypass vulnerability in calcom cal.com, published on 13 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-23478 and fix it if it is affected.\n\nWhat it is: CVE-2026-23478 is a critical authentication bypass vulnerability in calcom cal.com, published on 13 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-23478 in the wild and no public exploit code.\n\nAffected product: calcom cal.com. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-23478/ (Markdown: https://insights.sbomify.com/CVE-2026-23478/index.md)","id":"CVE-2026-23478","markdown":"https://insights.sbomify.com/CVE-2026-23478/index.md","name":"CVE-2026-23478","record":{"aliases":["GHSA-7hg4-x4pr-3hrg"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":true,"product_category":"Cal.com scheduling software","requires_auth":"none","summary":"Attackers can bypass authentication and take over any user account by exploiting an unvalidated email parameter in the custom JWT callback.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"cal.com","vendor":"cal"}],"cvss":{"score":10,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L","version":"4.0"},"cwes":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"},{"id":"CWE-602","name":"Client-Side Enforcement of Server-Side Security"}],"description":"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback","id":"CVE-2026-23478","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"redis-server use-after-free in unblock client flow may allow remote code execution","id":"CVE-2026-23479"},"packages":[],"prev":{"headline":"Rocket.Chat Unauthorized Access to OAuth App Details","id":"CVE-2026-23477"},"products":["cal.com"],"published":"2026-01-13","related":[{"cvss_score":9.9,"headline":"Cal.com Authentication Bypass via bad TOTP + password checks","id":"CVE-2025-66489","kev_date_added":null,"published":"2025-12-03"},{"cvss_score":8.8,"headline":"Improper Access Control in calcom/cal.com","id":"CVE-2023-1647","kev_date_added":null,"published":"2023-03-27"},{"cvss_score":6.5,"headline":"Cal.com not expiring old sessions after enabling 2FA","id":"CVE-2023-37919","kev_date_added":null,"published":"2023-07-25"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-01-14","vendors":["calcom"]},"summary":"Attackers can bypass authentication and take over any user account by exploiting an unvalidated email parameter in the custom JWT callback.","url":"https://insights.sbomify.com/CVE-2026-23478/"}