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CVE-2026-41236: Froxlor has privilege escalation in SSH key synchronization via symlinked `authorized_keys` path

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-04 · updated 2026-07-22
• Weakness: CWE-59

Description

Froxlor is open source server administration software. Version 2.3.6 contains a symlink-following flaw in the root-owned SSH key synchronization path used for customer FTP users. The provisioning code appends public keys to `~/.ssh/authorized_keys` under a customer-controlled home directory without verifying that the target path is not a symbolic link. If an attacker controls a shell-enabled customer account and can modify files inside the assigned home directory, the attacker can replace `~/.ssh/authorized_keys` with a symlink to `/root/.ssh/authorized_keys`. When Froxlor's privileged cron task later synchronizes SSH keys, it appends the attacker-supplied key into root's authorized key file, resulting in root SSH access. Version 2.3.7 contains a patch.

Affected products

• froxlor: = 2.3.6

References

• https://github.com/froxlor/froxlor/releases/tag/2.3.7
• https://github.com/froxlor/froxlor/security/advisories/GHSA-mq5v-pxpm-8jw2
• https://github.com/froxlor/froxlor/security/advisories/GHSA-mq5v-pxpm-8jw2

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