Path Traversal Leading to File Deletion in Ad Hoc Transfer and Web Transfer in Progress WS_FTP Server

published 2026-10-29 10 d ago modified 2026-10-30 9 d ago also EUVD-2026-113028

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits: 0; none known

Improper limitation of a pathname to a restricted directory in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow an unauthenticated attacker to affect files outside the intended directory.

Patch / fix

fixed in 1

Progress Software WS_FTP Server 2024.0.7, 2025.0.4

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 9 d ago (2026-10-30)

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

Progress Software WS_FTP Server

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory
CWE-73 External Control of File Name or Path

References

progress.lightning.force.com /lightning/r/Knowledge__kav/ka7Pb000001vl86IAA/view
vendor-advisory

Sources

CVE List CVE-2026-90871
NVD CVE-2026-90871

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary