PT-2026-51789 · Proftpd · Proftpd

Djnn + 1 · Published 2026-06-24 · Updated 2026-06-24 · CVE-2026-35025

NVD

CVSS v3.1

8.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated FTP users to circumvent Directory ACL restrictions by prefixing paths with /proc/self/root in the RNFR command handler. Attackers can exploit the unresolved symlink components in dir canonical path() to cause dir check() to perform lexical path comparisons that match no configured Directory block, enabling rename operations on files in DenyAll-protected directories and subsequent retrieval of those files. Mitigation: Sessions configured with DefaultRoot (chroot) are not affected, as chroot changes the directory to which /proc/self/root resolves.

Fix

Link Following

Weakness Enumeration

CWE-59

Related Identifiers

CVE-2026-35025

Affected Products

Proftpd

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-35025 · Security Note
• https://github.com/proftpd/proftpd/issues/2170 · Note
• https://vulncheck.com/advisories/proftpd-acl-bypass-via-proc-self-root-path-prefix-in-rnfr · Note
• http://proftpd.org · Note