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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.

PUBLISHED Reserved 2026-05-22 | Published 2026-05-23 | Updated 2026-05-23 | Assigner VulDB




LOW: 2.3CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
MEDIUM: 5.0CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
MEDIUM: 5.0CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
4.6AV:N/AC:H/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR

Problem types

Server-Side Request Forgery

Product status

4.9.0
affected

4.9.1
affected

4.9.2
affected

4.9.3
affected

4.9.4
affected

Timeline

2026-05-22:Advisory disclosed
2026-05-22:VulDB entry created
2026-05-22:VulDB entry last update

Credits

Eric-z (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/365251 (VDB-365251 | calcom cal.diy Logo API route.ts validateUrlForSSRF server-side request forgery) vdb-entry technical-description

vuldb.com/vuln/365251/cti (VDB-365251 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/812176 (Submit #812176 | cal.com <= v4.9.4 Server-Side Request Forgery (CWE-918)) third-party-advisory

gist.github.com/YLChen-007/b3d0b85767b7e346a291933d602fbb3b exploit

cve.org (CVE-2026-9304)

nvd.nist.gov (CVE-2026-9304)

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