CVE-2021-23824: Crowcpp Crow

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

This affects the package Crow before 0.3+4. When using attributes without quotes in the template, an attacker can manipulate the input to introduce additional attributes, potentially executing code. This may lead to a Cross-site Scripting (XSS) vulnerability, assuming an attacker can influence the value entered into the template. If the template is used to render user-generated content, this vulnerability may escalate to a persistent XSS vulnerability.

Affected products

• Crowcpp Crow: before 0.3\+4 (fixed in 0.3\+4)

Published 2022-01-13. Last modified 2026-06-17.