Content Injection

published 2022-01-13 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-10752

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 2

n/a Crow 0.3+4

github.com/CrowCpp/Crow#317 pull request
github.com/CrowCpp/Crow/releases/tag/v0.3%2B4 release

Exploit prediction

0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

snyk.io https://snyk.io/vuln/SNYK-UNMANAGED-CROW-2336164 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

n/a Crow

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /CrowCpp/Crow/pull/317
issue-tracking, patch, third-party-advisory
snyk.io /vuln/SNYK-UNMANAGED-CROW-2336164
exploit, third-party-advisory
github.com /CrowCpp/Crow/releases/tag/v0.3%2B4
release-notes, third-party-advisory

Sources

CVE List CVE-2021-23824
NVD CVE-2021-23824

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary