CVE-2021-23824: Content Injection

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-01-13 · updated 2026-06-17
Weakness: CWE-79

Description

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

Crow: before 0.3\+4 — fixed in 0.3\+4

How to fix

Upgrade to a fixed version: Crow 0.3\+4. Check the vendor advisory for mitigations.

References

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