CVE-2026-9304

MEDIUM

calcom cal.diy Logo API route.ts validateUrlForSSRF server-side request forgery

Title source: cna

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.

References (4)

Core 4

Core References

Vdb Entry, Technical Description vdb-entry technical-description

VDB-365251 | calcom cal.diy Logo API route.ts validateUrlForSSRF server-side request forgery

https://vuldb.com/vuln/365251

Signature, Permissions Required signature permissions-required

VDB-365251 | CTI Indicators (IOB, IOC, IOA)

https://vuldb.com/vuln/365251/cti

Third Party Advisory third-party-advisory

Submit #812176 | cal.com <= v4.9.4 Server-Side Request Forgery (CWE-918)

https://vuldb.com/submit/812176

Exploit exploit

https://gist.github.com/YLChen-007/b3d0b85767b7e346a291933d602fbb3b

Scores

CVSS v3 5.0

EPSS 0.0024

EPSS Percentile 14.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-918

Status published

Products (5)

calcom/cal.diy 4.9.0

calcom/cal.diy 4.9.1

calcom/cal.diy 4.9.2

calcom/cal.diy 4.9.3

calcom/cal.diy 4.9.4

Published May 23, 2026

Tracked Since May 23, 2026