CVE-2026-93353: low-severity vulnerability in 9001 copyparty
copyparty SFTP Volume Restriction Bypass via mkdir/rmdir/chattr Handlers
Published · Updated
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28Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 2.3epss 0.3%
copyparty contains a volume restriction bypass vulnerability in its SFTP front end that allows authenticated SFTP users to create, remove, and truncate arbitrary paths outside permitted volume boundaries by exploiting three handlers that bypass the xvol volflag enforcement. The _mkdir, _rmdir, and _chattr handlers construct destination paths using vfs.get(), vn.canonical(), and os.path.join() without invoking the chk_ap access check, enabling attackers to traverse symlinks leaving a volume's top directory and perform unauthorized file creation, deletion, or truncation via SSH_FXP_SETSTAT operations on paths outside any volume the account is authorized to access.
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products
9001 · copypartypublic PoCs found — 1
cve_referenceeuriconicacio.github.io/blog/cve-2026-93353-a-volume-guard-enforced-one-call-site-at-a-time/unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — 9001 copyparty
In the same product, most dangerous first.
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