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8 vulnerabilities by cal
CVE-2026-23478 (GCVE-0-2026-23478)
Vulnerability from cvelistv5 – Published: 2026-01-13 21:37 – Updated: 2026-01-14 16:56
VLAI
Title
Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/calcom/cal.com/security/adviso… | x_refsource_CONFIRM |
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CVE-2025-66489 (GCVE-0-2025-66489)
Vulnerability from cvelistv5 – Published: 2025-12-03 19:44 – Updated: 2025-12-03 21:48
VLAI
Title
Cal.com Authentication Bypass via bad TOTP + password checks
Summary
Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/calcom/cal.com/security/adviso… | x_refsource_CONFIRM |
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CVE-2023-37919 (GCVE-0-2023-37919)
Vulnerability from cvelistv5 – Published: 2023-07-25 20:42 – Updated: 2024-10-16 19:45
VLAI
Title
Cal.com not expiring old sessions after enabling 2FA
Summary
Cal.com is open-source scheduling software. A vulnerability allows active sessions associated with an account to remain active even after enabling 2FA. When activating 2FA on a Cal.com account that is logged in on two or more devices, the account stays logged in on the other device(s) stays logged in without having to verify the account owner's identity. As of time of publication, no known patches or workarounds exist.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-613 - Insufficient Session Expiration
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/calcom/cal.com/security/adviso… | x_refsource_CONFIRM |
Impacted products
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CVE-2023-1647 (GCVE-0-2023-1647)
Vulnerability from cvelistv5 – Published: 2023-03-27 00:00 – Updated: 2025-02-19 16:32
VLAI
Title
Improper Access Control in calcom/cal.com
Summary
Improper Access Control in GitHub repository calcom/cal.com prior to 2.7.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-284 - Improper Access Control
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| calcom | calcom/cal.com |
Affected:
unspecified , < 2.7
(custom)
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CVE-2026-23478 (GCVE-0-2026-23478)
Vulnerability from nvd – Published: 2026-01-13 21:37 – Updated: 2026-01-14 16:56
VLAI
Title
Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/calcom/cal.com/security/adviso… | x_refsource_CONFIRM |
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CVE-2025-66489 (GCVE-0-2025-66489)
Vulnerability from nvd – Published: 2025-12-03 19:44 – Updated: 2025-12-03 21:48
VLAI
Title
Cal.com Authentication Bypass via bad TOTP + password checks
Summary
Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/calcom/cal.com/security/adviso… | x_refsource_CONFIRM |
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CVE-2023-37919 (GCVE-0-2023-37919)
Vulnerability from nvd – Published: 2023-07-25 20:42 – Updated: 2024-10-16 19:45
VLAI
Title
Cal.com not expiring old sessions after enabling 2FA
Summary
Cal.com is open-source scheduling software. A vulnerability allows active sessions associated with an account to remain active even after enabling 2FA. When activating 2FA on a Cal.com account that is logged in on two or more devices, the account stays logged in on the other device(s) stays logged in without having to verify the account owner's identity. As of time of publication, no known patches or workarounds exist.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-613 - Insufficient Session Expiration
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/calcom/cal.com/security/adviso… | x_refsource_CONFIRM |
Impacted products
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CVE-2023-1647 (GCVE-0-2023-1647)
Vulnerability from nvd – Published: 2023-03-27 00:00 – Updated: 2025-02-19 16:32
VLAI
Title
Improper Access Control in calcom/cal.com
Summary
Improper Access Control in GitHub repository calcom/cal.com prior to 2.7.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-284 - Improper Access Control
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| calcom | calcom/cal.com |
Affected:
unspecified , < 2.7
(custom)
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