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🐍 PyPI
Not in CISA KEV
HIGH severity

CVE-2022-2523 — fava

HIGHFix: beancount/fava@dccfb6a

CVE-2022-2523 is a high-severity (CVSS 8) Cross-site Scripting (XSS) vulnerability in fava. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for fava — see the affected versions and patch details below.

Cross-site Scripting (XSS) - Reflected in beancount/fava

Also known asGHSA-q8hg-3vqv-f8v3PYSEC-2022-240
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 26, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk+0.03%
Lower risk than most CVEs58th percentile — riskier than 58% of all scored CVEsHighest risk
0.00%0.46%0.91%1.37%0.3%0.9%Apr 26Aug 26Oct 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
🐍fava

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) - Reflected in GitHub repository beancount/fava prior to 1.22.2. The query_string parameter of Fava is vulnerable to reflected cross-site scripting, for which a attacker can modify any information that the user is able to modify. This issue is fixed in version 1.22.2.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIfavaall versions1.22.2pip install --upgrade 'fava==1.22.2'

Affected Products

1 product · 1 configurations
Application
favafava_project
< 1.22.2
range
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) - Reflected in GitHub repository beancount/fa…

huntr.devNVDJul 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update fava to 1.22.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-2523 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) - Reflected in GitHub repository beancount/fava prior to 1.22.2. The `query_string` parameter of Fava is vulnerable to reflected cross-site scripting, for which a attacker can modify any information that the user is able to modify. This issue is fixed in version 1.22.2.
O3 Security · Impact-Aware SCA

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CVE-2022-2523: fava XSS — Fixed in 1.22.2