CVE-2026-23478— Cal.com has an Authentication Bypass via Unvalidated Email in Custom JWT Callback
Possible ATT&CK Techniques 1AI
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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
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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Vendor Advisories for CVE-2026-23478 (1)
IV. Related Vulnerabilities
Same vendor: calcom
- CVE-2025-71389
Cal.com before 5.9.9 Remote Code Execution via RSC - CVE-2024-58355
Cal.com through 4.7.15 Cross-Site Scripting via booking ques - CVE-2024-58354
cal.com Repository Takeover via pull_request_target Workflow - CVE-2024-58353
Cal.com through 4.7.15 Cross-Site Scripting via booking ques - CVE-2026-63768
cal.diy 6.2.0 Conferencing OAuth Callback Open Redirect via
Same weakness: CWE-602
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JupyterLab 4.6.0 Plugin Manager Lock-Rule Enforcement Bypass - CVE-2026-59504
Priority – CWE-602: Client-Side Enforcement of Server-Side - CVE-2026-16480
IBM® Db2® is affected by an improper authorization vulnerabi - CVE-2026-63301
Denial of Service in Quick.CMS - CVE-2026-64813
JetBrains IntelliJ IDEA 处理逻辑错误漏洞
V. Comments for CVE-2026-23478
Anonymous User
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