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Not in CISA KEV
MEDIUM severity

CVE-2020-27666

MEDIUMFix: strapi/strapi#8440

CVE-2020-27666 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in strapi-plugin-content-manager. O3 Security confirms whether CVE-2020-27666 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Cross-site Scripting in Strapi

Also known asGHSA-qvp5-mm7v-4f36
Published
Oct 22, 2020
Updated
Jul 8, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Jul 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
📦strapi-plugin-content-manager

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

Description

Strapi before 3.2.5 has stored XSS in the wysiwyg editor's preview feature.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmstrapi-plugin-content-managerall versions3.2.5

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for strapi-plugin-content-manager. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update strapi-plugin-content-manager to 3.2.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-27666 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2020-27666 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2020-27666. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Strapi before 3.2.5 has stored XSS in the wysiwyg editor's preview feature.
O3 Security · Impact-Aware SCA

Is CVE-2020-27666 in your dependencies?

O3 detects CVE-2020-27666 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

CVE-2020-27666: Cross-site Scripting in Strapi… | O3 Security