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CVE-2026-9303— calcom cal.diy cross-site request forgery

Quick assessment

Affected
calcom cal.diy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

cal.diy是Cal开源的一个开源日程调度平台。 cal.diy 4.9.4及之前版本存在安全漏洞，该漏洞源于未知函数，可能导致跨站请求伪造。

CVSS 4.3 · Medium EPSS 0.23% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
calcom cal.diy 4.9.0 affected
4.9.1 affected
4.9.2 affected
4.9.3 affected
4.9.4 affected
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I. Basic Information for CVE-2026-9303

Vulnerability Information
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Vulnerability Title
calcom cal.diy cross-site request forgery
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in calcom cal.diy up to 4.9.4. Impacted is an unknown function. The manipulation leads to cross-site request forgery. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
cal.diy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cal.diy是Cal开源的一个开源日程调度平台。 cal.diy 4.9.4及之前版本存在安全漏洞，该漏洞源于未知函数，可能导致跨站请求伪造。
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.diy 4.9.0 cpe:2.3:a:calcom:cal.diy:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-9303

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III. Intelligence Information for CVE-2026-9303

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Proof of Concept for CVE-2026-9303 (2)

IV. Related Vulnerabilities

Same product: cal.diy
Same vendor: calcom
Same weakness: CWE-352

V. Comments for CVE-2026-9303

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