{"id":"CVE-2026-35025","title":"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","summary":"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. Attack…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-59"],"vendor":"proftpd","product":"proftpd","affected":["proftpd <= 1.3.9b","proftpd = 1.3.10"],"published":"2026-06-24","updated":"2026-07-02","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-35025","references":[{"url":"http://www.proftpd.org/","label":"disclosure@vulncheck.com"},{"url":"https://github.com/proftpd/proftpd/issues/2170","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/proftpd-acl-bypass-via-proc-self-root-path-prefix-in-rnfr","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00505,"epssPercentile":0.40572,"ingestedAt":"2026-07-03T13:02:27.989Z","slug":"CVE-2026-35025","body":"## Overview\n\nProFTPD 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.\n\n## Affected\n\n- `proftpd <= 1.3.9b`\n- `proftpd = 1.3.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}