Server Side Template Injection in MCMS

published 2022-02-18 4 y ago modified 2026-06-17 4 mo ago also GHSA-gc79-gh4f-9g6w , EUVD-2022-1009

cvss: 9.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.7%; EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits: 0; none known

MCMS v5.2.5 was discovered to contain a Server Side Template Injection (SSTI) vulnerability via the Template Management module.

Exploit prediction

2.73% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/ming-soft/MCMS/issues/59 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
NVD	2.0	6.4	AV:N/AC:L/Au:N/C:N/I:P/A:P
GitHub	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	net.mingsoft:ms-mcms	<=5.2.5	no fix listed

Classification

Weakness

CWE-94 Improper Control of Generation of Code
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

github.com /ming-soft/MCMS/issues/59
web, exploit, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-46063
advisory

Sources

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