TI-2024-14253 Aliases CVE-2024-21496 GHSA-ff72-ff42-c3gw

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

LOW 28CWE-79Published 2024-02-17 · Updated 2024-11-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

All versions of the package github.com/greenpau/caddy-security are vulnerable to Cross-site Scripting (XSS) via the Referer header, due to improper input sanitization. Although the Referer header is sanitized by escaping some characters that can allow XSS (e.g., [&], [<], [>], ["], [']), it does not account for the attack based on the JavaScript URL scheme (e.g., javascript:alert(document.domain)// payload). Exploiting this vulnerability may not be trivial, but it could lead to the execution of malicious scripts in the context of the target user’s browser, compromising user sessions.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00576 47th percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	github.com/greenpau/caddy-security	all versions	—	No fix listed	CNA
—	github.com/greenpau/caddy-security (Go)	up to 1.1.23	—	No fix listed	GHSA-ff72-ff42-c3gw

github.com/greenpau/caddy-security Vendor— Affected all versions Fixed in — No fix listed CNA
github.com/greenpau/caddy-security (Go) Vendor— Affected up to 1.1.23 Fixed in — No fix listed GHSA-ff72-ff42-c3gw

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:authcrunch:caddy-security:-:::::::*	not specified by NVD	Vulnerable	Authcrunch

cpe:2.3:a:authcrunch:caddy-security:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Authcrunch

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2024-21496
2026-10-03 Alias added: GHSA-ff72-ff42-c3gw

References

Exploit 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2024-21496

Other 1

https://blog.trailofbits.com/2023/09/18/security-flaws-in-an-sso-plugin-for-caddy

TI-2023-28778 The caddy-security plugin 1.1.20 for Caddy allows reflected XSS via a GET request to a… CVSS 3.1MEDIUM 6.1
TI-2024-14249 Insufficient session expiration in github.com/greenpau/caddy-security CVSS 3.1HIGH 8.1
TI-2024-14255 Server-side request forgery in github.com/greenpau/caddy-security CVSS 3.1MEDIUM 5.3
TI-2024-14257 Missing brute-force protection in github.com/greenpau/caddy-security CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences