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

MEDIUM 5.4CVE-2022-33154 · GHSA-374w-gwqr-fmxg · Published 12/07/2022 · updated 17/06/2026

In short

CVE-2022-33154 is a MEDIUM (CVSS 5.4) vulnerability affecting brotkrueml/schema, schema (schema project).
Chance of exploitation in the next 30 days (EPSS): 0.52%, higher than 44.2% of all vulnerabilities.
Fix: update to 2.5.1, 1.13.1 or later.

Package	Affected versions	Patched versions
brotkrueml/schema Packagist	`≥ 2.0.0, < 2.5.1< 1.13.1`	`2.5.11.13.1`
schema schema_project	`≥ 2.0.0, < 2.5.1< 1.13.1`	`2.5.11.13.1`

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

NVD description

The schema (aka Embedding schema.org vocabulary) extension before 1.13.1 and 2.x before 2.5.1 for TYPO3 allows XSS.

Running one of these products? Scan your site to see whether it exposes a vulnerable version.