XSS in Authcrunch Caddy-Security
CVE-2024-21496
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Authcrunch Caddy-Security
- Github.com/greenpau/caddy-Security — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6249860 (Third Party Advisory)
- github.com/greenpau/caddy-security/issues/267 (Exploit, Issue Tracking)
- blog.trailofbits.com/2023/09/18/security-flaws-in-an-sso-plugin-for-caddy/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2024-21496?
- CVE-2024-21496 is a medium-severity vulnerability in Authcrunch Caddy-Security, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2024-02-17.
- How severe is CVE-2024-21496?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2024-21496 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.