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CVE-2026-115336— FTP Quota Accounting Bypass in Progress WS_FTP Server

Quick assessment

Affected
Progress Software WS_FTP Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Progress Software 的 WS_FTP Server 在 Windows 平台上 2025.0.5 版本之前的版本中存在配额统计错误，该漏洞可能允许拥有上传和删除权限的已认证用户超出存储配额限制，进而导致拒绝服务（DoS）。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Progress Software WS_FTP Server 2025.0.0< 2025.0.5 affected
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I. Basic Information for CVE-2026-115336

Vulnerability Information
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Vulnerability Title
FTP Quota Accounting Bypass in Progress WS_FTP Server
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect quota accounting in Progress Software WS_FTP Server releases prior to 2025.0.5 on Windows could allow an authenticated user with upload and delete permissions to exceed storage quotas, potentially causing denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
数值计算不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Progress Software WS_FTP Server 2025.0.0 ~ 2025.0.5 -

II. Public POCs for CVE-2026-115336

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-115336

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Other References for CVE-2026-115336 (1)

Same Patch Batch · Progress Software · 2026-11-09 · 6 CVEs total

CVE-2026-115338 8.1 HIGH Insecure XFT Transport in Progress WS_FTP Server
CVE-2026-115341 7.7 HIGH Unauthorized File Disclosure via Path Traversal in Thin Client Web Transfer in Progress WS
CVE-2026-115339 7.5 HIGH Unauthenticated XFT Memory Exhaustion in Progress WS_FTP Server
CVE-2026-115340 7.1 HIGH Insecure Storage of Web Transfer Credentials in Progress WS_FTP Server
CVE-2026-115337 6.3 MEDIUM Folder Permission Bypass in Progress WS_FTP Server

IV. Related Vulnerabilities

Same product: WS_FTP Server
Same vendor: Progress Software
Same weakness: CWE-682