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MEDIUM severity

CVE-2018-12104 — knowledge-repo

MEDIUMFix: airbnb/knowledge-repo#558

CVE-2018-12104 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in knowledge-repo. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for knowledge-repo — see the affected versions and patch details below.

Airbnb Knowledge Repo XSS In Comments

Also known asGHSA-xmw7-848p-p95wPYSEC-2018-116
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.3%probability of exploitation in next 30 days
Lower Risk-0.00%
Lower risk than most CVEs70th percentile — riskier than 70% of all scored CVEsHighest risk
0.00%0.61%1.22%1.83%0.2%1.3%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
🐍knowledge-repo

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

Cross-site scripting (XSS) vulnerability in Airbnb Knowledge Repo prior to 0.9.0 allows remote attackers to inject arbitrary web scripts or HTML via the post comments functionality, as demonstrated by the post/posts/new_report.kp URI.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIknowledge-repoall versions0.9.0pip install --upgrade 'knowledge-repo==0.9.0'

Affected Products

1 product · 1 configurations
Application
knowledge repoairbnb
1 version
0.7.4
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.

Cross-site scripting (XSS) vulnerability in Airbnb Knowledge Repo 0.7.4 …

github.comNVDAug 2018

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update knowledge-repo to 0.9.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-12104 is resolved across your whole dependency graph.

  3. Workarounds

    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

Cross-site scripting (XSS) vulnerability in Airbnb Knowledge Repo prior to 0.9.0 allows remote attackers to inject arbitrary web scripts or HTML via the post comments functionality, as demonstrated by the `post/posts/new_report.kp` URI.
O3 Security · Impact-Aware SCA

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CVE-2018-12104: knowledge-repo XSS — Fixed in 0.9.0