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CVE-2026-9304— calcom cal.diy Logo API route.ts validateUrlForSSRF server-side request forgery

CVSS 5.0 · Medium EPSS 0.04% · P12

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProductVersion RangeStatus
calcomcal.diy4.9.0affected
4.9.1affected
4.9.2affected
4.9.3affected
4.9.4affected
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I. Basic Information for CVE-2026-9304

Vulnerability Information
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Vulnerability Title
calcom cal.diy Logo API route.ts validateUrlForSSRF server-side request forgery
Source: NVD (National Vulnerability Database)
Vulnerability Description
A security flaw has been discovered in calcom cal.diy up to 4.9.4. The affected element is the function validateUrlForSSRF of the file apps/web/app/api/logo/route.ts of the component Logo API. The manipulation results in server-side request forgery. It is possible to launch the attack remotely. Attacks of this nature are highly complex. The exploitability is described as difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
cal.diy 代码问题漏洞
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及之前版本存在代码问题漏洞，该漏洞源于Logo API组件文件apps/web/app/api/logo/route.ts中函数validateUrlForSSRF，可能导致服务端请求伪造。
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

VendorProductAffected VersionsCPESubscribe
calcomcal.diy 4.9.0 cpe:2.3:a:calcom:cal.diy:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-9304

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III. Intelligence Information for CVE-2026-9304

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Proof of Concept for CVE-2026-9304 (1)

IV. Related Vulnerabilities

Same product: cal.diy
Same vendor: calcom
Same weakness: CWE-918

V. Comments for CVE-2026-9304

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