CVE-2026-9304

MediumCVSS 5.0

Published: 23/05/2026(UTC)Updated: 23/07/2026(UTC)Translated: 25/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.20%

10th percentile - higher than 10% of all known CVEs

Summary

A vulnerability was found in calcom cal.diy up to 4.9.4 in the validateUrlForSSRF function in the file apps/web/app/api/logo/route.ts of the Logo API component. Manipulation leads to server-side request forgery. The attack is remote but difficult to exploit. The exploit has been published. The vendor did not respond.

Risk Assessment

An attacker can use the server to scan internal networks or access internal resources, potentially leading to data leakage.

Recommendation

Implement strict URL validation, use a whitelist of allowed domains, and restrict access to internal network resources.

Other vulnerabilities in cal.diy

CVE-2026-63768Medium
Vulnerability in cal.diy up to version 6.2.0. Open redirect in the conferencing OAuth callback endpoint. Attackers can redirect users to arbitrary URLs via a malicious state parameter.

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS