What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-23 · updated 2026-07-23
• Weakness: CWE-918

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.

Affected products

• calcom cal.diy: 4.9.0, 4.9.1, 4.9.2, 4.9.3, 4.9.4

References

• https://gist.github.com/YLChen-007/b3d0b85767b7e346a291933d602fbb3b
• https://vuldb.com/submit/812176
• https://vuldb.com/vuln/365251
• https://vuldb.com/vuln/365251/cti

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