CVE Catalog

CVE-2026-79363

MediumCVSS 5.9
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.18%

7th percentile - higher than 7% of all known CVEs

Summary

Cloudron 9.1.7 and 9.2 contain a stored cross-site scripting (XSS) vulnerability in the Branding Footer feature. An authenticated administrator can store crafted HTML containing JavaScript event handlers in the Footer setting. The stored value is rendered without sufficient sanitization on the public login / OpenID interaction page and in the System Event Log, causing attacker-controlled JavaScript to execute in the Cloudron web origin when an affected page is viewed.

Risk Assessment

A malicious administrator (or someone who has taken over an administrator account) can inject a malicious script that executes in other users' browsers, potentially leading to session theft, data exfiltration, or further attacks within the Cloudron application context.

Recommendation

Update Cloudron to a version that includes a fix (if available). Additionally, limit trust in administrator accounts and regularly audit Branding Footer settings for dangerous content.

Related vulnerabilities

Original NVD description (English source)

Cloudron 9.1.7 and 9.2 contain a stored cross-site scripting (XSS) vulnerability in the Branding Footer feature. An authenticated administrator can store crafted HTML containing JavaScript event handlers in the Footer setting. The stored value is rendered without sufficient sanitization on the public login / OpenID interaction page and in the System Event Log, causing attacker-controlled JavaScript to execute in the Cloudron web origin when an affected page is viewed.

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