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.NET
.NET NuGet
Not in CISA KEV
HIGH severity

CVE-2019-11401 — sscms

HIGHFix: siteserver/cms@a7edb9c

CVE-2019-11401 is a high-severity (CVSS 7.2) Unrestricted File Upload vulnerability in sscms. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for sscms — see the affected versions and patch details below.

SiteServer CMS RCE via unsafe file upload

Also known asGHSA-ff4w-8chr-w2x9
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs87th percentile — riskier than 87% of all scored CVEsHighest risk
1.83%2.34%2.86%3.37%2.3%2.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
.NETsscms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

A issue was discovered in SiteServer CMS prior to version 6.12. It allows remote attackers to execute arbitrary code because an administrator can add the permitted file extension .aassp, which is converted to .asp because the "as" substring is deleted.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetsscmsall versions6.12dotnet add package sscms --version 6.12

Affected Products

1 product · 1 configurations
Application
siteserver cmssiteserver
1 version
6.9.0
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A issue was discovered in SiteServer CMS 6.9.0. It allows remote attacke…

github.comNVDApr 2019

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for sscms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update sscms to 6.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-11401 is resolved across your whole dependency graph.

  3. Workarounds

    Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.

Frequently Asked Questions

A issue was discovered in SiteServer CMS prior to version 6.12. It allows remote attackers to execute arbitrary code because an administrator can add the permitted file extension `.aassp`, which is converted to `.asp` because the "as" substring is deleted.
O3 Security · Impact-Aware SCA

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CVE-2019-11401: sscms RCE — Fixed in 6.12