SSCMS download PathUtils.RemoveParentPath path traversal

published 2026-03-16 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-12359

cvss: 3.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits: 0; none known

A vulnerability was determined in SSCMS up to 7.4.0. This vulnerability affects the function PathUtils.RemoveParentPath of the file /api/admin/plugins/install/actions/download. This manipulation of the argument path causes path traversal. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 7 mo ago (2026-03-16)

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

yuque.com https://www.yuque.com/la12138/pa2fpb/mbcvbk402bx1qbft?singleDoc referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	5.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
CNA	3.1	3.8	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L/E:P/RL:X/RC:R
CNA	3.0	3.8	CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L/E:P/RL:X/RC:R
CNA	2.0	4.7	AV:N/AC:L/Au:M/C:N/I:P/A:P/E:POC/RL:ND/RC:UR
CNA	4.0	2.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA	3.1	3.8	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L
CNA	2.0	4.7	AV:N/AC:L/Au:M/C:N/I:P/A:P

Affected products

n/a SSCMS

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

yuque.com /la12138/pa2fpb/mbcvbk402bx1qbft?singleDoc
exploit
vuldb.com /?id.351146
vdb-entry, technical-description
vuldb.com /?ctiid.351146
signature, permissions-required
vuldb.com /?submit.770536
third-party-advisory

Sources

CVE List CVE-2026-4222
NVD CVE-2026-4222

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