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MEDIUM severity

GHSA-9p29-94hp-8rvc

MEDIUMFix: increments/qiita-markdown@b5d4e60

GHSA-9p29-94hp-8rvc is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in qiita-markdown. O3 Security confirms whether GHSA-9p29-94hp-8rvc is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

qiita-markdown Cross-site Scripting vulnerability

Also known asCVE-2021-28833
Published
Aug 2, 2021
Updated
Nov 8, 2023
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 8, 2023 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
💎qiita-markdown

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

Description

Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
💎RubyGemsqiita-markdownall versions0.34.0

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for qiita-markdown. 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 qiita-markdown to 0.34.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9p29-94hp-8rvc 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-9p29-94hp-8rvc 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-9p29-94hp-8rvc. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Increments Qiita::Markdown before 0.34.0 allows XSS via a crafted gist link, a different vulnerability than CVE-2021-28796.
O3 Security · Impact-Aware SCA

Is GHSA-9p29-94hp-8rvc in your dependencies?

O3 detects GHSA-9p29-94hp-8rvc across RubyGems dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

GHSA-9p29-94hp-8rvc: qiita-markdown… | O3 Security