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MEDIUM severity

CVE-2022-33154 — schema

MEDIUM

CVE-2022-33154 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in brotkrueml/schema. A fix is available for brotkrueml/schema — see the affected versions and patch details below.

brotkrueml/schema fails to properly encode user input for output in HTML context, leading to XSS

Also known asGHSA-374w-gwqr-fmxg
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk
0.00%0.34%0.68%1.02%0.2%0.5%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

2 pkgs affected
🐘brotkrueml/schema🐘brotkrueml/schema

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

Description

The extension fails to properly encode user input for output in HTML context. A TYPO3 backend user account is required to exploit the vulnerability.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistbrotkrueml/schema≥ 2.0.0&&< 2.5.12.5.1composer require brotkrueml/schema:^2.5.1
🐘Packagistbrotkrueml/schemaall versions1.13.1composer require brotkrueml/schema:^1.13.1

Affected Products

1 product · 2 configurations
Application
schemaschema_project
≥ 2.0.0 && < 2.5.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update brotkrueml/schema to 2.5.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-33154 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

The extension fails to properly encode user input for output in HTML context. A TYPO3 backend user account is required to exploit the vulnerability.
O3 Security · Impact-Aware SCA

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CVE-2022-33154: schema — Fixed in 2.5.1