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CVE-2024-21496

18
FAUCET Score

CVE-2024-21496 is a Cross-site Scripting (XSS) vulnerability affecting all versions of the github.com/greenpau/caddy-security package, including authcrunch caddy-security. It stems from insufficient sanitization of the Referer header, specifically failing to account for JavaScript URL scheme payloads. Rated as MEDIUM severity with a CVSS score of 6.1, exploitation requires user interaction and could lead to malicious script execution in the user's browser, potentially compromising sessions. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:authcrunch:caddy-security:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.58%
Probability of exploitation in next 30 days
EPSS Percentile
44.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0058 is in the 47th percentile among its peer group of 26,234 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

goGHSA-ff72-ff42-c3gwmedium

Cross-site Scripting in github.com/greenpau/caddy-security

Feb 17, 2024

References

blog.trailofbits.com / 2023/09/18/security-flaws-in-an-sso-plugin-for-caddy
ExploitThird Party Advisory
github.com / greenpau/caddy-security/issues/267
ExploitIssue Tracking
security.snyk.io / vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6249860
Third Party Advisory