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MEDIUM severity

CVE-2018-6464 — simditor

MEDIUM

CVE-2018-6464 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in simditor. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Simditor XSS Vulnerability

Also known asGHSA-p9wj-wrrm-84m5
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs53th percentile — riskier than 53% of all scored CVEsHighest risk
0.00%0.40%0.79%1.19%0.2%0.7%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

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

34other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
simditornpm
534downloads / week

Description

Simditor v2.3.11 allows XSS via crafted use of svg/onload=alert in a TEXTAREA element, as demonstrated by Firefox 54.0.1.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
📦npmsimditorall versionsNo fix

Affected Products

1 product · 1 configurations
Application
simditormycolorway
1 version
2.3.11
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.

Simditor v2.3.11 allows XSS via crafted use of svg/onload=alert in a TEX…

github.comNVDFeb 2020

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Remediation status

    The records we use list no patched version of simditor for CVE-2018-6464. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Simditor v2.3.11 allows XSS via crafted use of svg/onload=alert in a TEXTAREA element, as demonstrated by Firefox 54.0.1.
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CVE-2018-6464: simditor: Simditor XSS Vulnerability