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Not in CISA KEV
MEDIUM severity

GHSA-947x-pv47-pp3q

MEDIUMFix: webrecorder/pywb@f7bd84c

GHSA-947x-pv47-pp3q is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in pywb. O3 Security confirms whether GHSA-947x-pv47-pp3q is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Cross-site scripting in pywb

Also known asCVE-2021-39286PYSEC-2021-120
Published
Sep 2, 2021
Updated
Oct 25, 2024
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 25, 2024 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐍pywb

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

Description

Webrecorder pywb before 2.6.0 allows XSS because it does not ensure that Jinja2 templates are autoescaped.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIpywball versions2.6.0

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pywb. 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 pywb to 2.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-947x-pv47-pp3q 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-947x-pv47-pp3q 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-947x-pv47-pp3q. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Webrecorder pywb before 2.6.0 allows XSS because it does not ensure that Jinja2 templates are autoescaped.
O3 Security · Impact-Aware SCA

Is GHSA-947x-pv47-pp3q in your dependencies?

O3 detects GHSA-947x-pv47-pp3q across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

GHSA-947x-pv47-pp3q: Cross-site scripting in… | O3 Security