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CVE-2026-23478— Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback

Quick assessment

Affected
calcom cal.com
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cal.com是Cal.com开源的一个开源的日程安排软件。 Cal.com 3.1.6版本至6.0.7之前版本存在安全漏洞，该漏洞源于自定义NextAuth JWT回调存在缺陷，可能导致攻击者通过session.update()获取对任何用户帐户的完全身份验证访问权限。

AI Predicted 9.8 Difficulty: Easy EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1136 · Create Account
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I. Basic Information for CVE-2026-23478

Vulnerability Information
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Vulnerability Title
Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
服务端安全的客户端实施
Source: CVE Program / CVE List V5
Vulnerability Title
Cal.com 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cal.com是Cal.com开源的一个开源的日程安排软件。 Cal.com 3.1.6版本至6.0.7之前版本存在安全漏洞，该漏洞源于自定义NextAuth JWT回调存在缺陷，可能导致攻击者通过session.update()获取对任何用户帐户的完全身份验证访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
calcom cal.com >= 3.1.6, < 6.0.7 -

II. Public POCs for CVE-2026-23478

# POC Description Source Link Shenlong Link
1 CVE-2026-23478 https://github.com/Ashwesker/Ashwesker-CVE-2026-23478 POC Details
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III. Intelligence Information for CVE-2026-23478

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Vendor Advisories for CVE-2026-23478 (1)

IV. Related Vulnerabilities

Same product: cal.com
Same vendor: calcom
Same weakness: CWE-602

V. Comments for CVE-2026-23478

Anonymous User
2026-01-15 06:09:08

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