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📦 npm

GHSA-h4hv-92pp-pcjg

HIGH

GHSA-h4hv-92pp-pcjg is a high-severity (CVSS 7.2) Cross-site Scripting (XSS) vulnerability in cyberchef. O3 Security confirms whether GHSA-h4hv-92pp-pcjg is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

CyberChef has a Cross-site Scripting issue

Also known asCVE-2026-42615
Published
Apr 29, 2026
Updated
May 6, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed

Blast Radius

1 pkg affected
📦cyberchef

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

GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmcyberchefall versions11.0.0

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for cyberchef. 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 cyberchef to 11.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h4hv-92pp-pcjg 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 GHSA-h4hv-92pp-pcjg 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 GHSA-h4hv-92pp-pcjg. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.
O3 Security · Impact-Aware SCA

Is GHSA-h4hv-92pp-pcjg in your dependencies?

O3 detects GHSA-h4hv-92pp-pcjg across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.