CVE-2024-21496: All versions of the package github.com/greenpau/caddy-security are vulnerable to Cross-site Scripting (XSS) vi

Routine

MEDIUM 6.1MITIGATE

CVE-2024-21496 is a medium-severity flaw (CVSS 6.1) affecting caddy-security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-02-17
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: authcrunch

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-02-17 05:15 UTCPublished CVE record published
2026-06-17 07:09 UTCUpdated Record last modified

authcrunch caddy-security MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy caddy-security || rpm -q caddy-security || caddy-security --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-21496?

caddy-security: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-21496 being exploited?

CVE-2024-21496 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-21496 affect?

CVE-2024-21496 affects caddy-security. Severity is medium (CVSS 6.1). 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 tha

How urgent is CVE-2024-21496?

Priority 38/100. Public exploit reference

Software pages

GitHub vulnerabilities · Caddy vulnerabilities

Related CVEs

CVE-2024-21500 MEDIUM 4.8 MITIGATE All versions of the package github.com/greenpau/caddy-security are vulnerable to Improper Restriction of Exces
CVE-2024-21499 MEDIUM 4.3 MITIGATE All versions of the package github.com/greenpau/caddy-security are vulnerable to HTTP Header Injection via the
CVE-2024-21498 MEDIUM 5.3 MITIGATE All versions of the package github.com/greenpau/caddy-security are vulnerable to Server-side Request Forgery (
CVE-2024-21497 MEDIUM 5.4 MITIGATE Versions of the package github.com/greenpau/caddy-security are vulnerable to Open Redirect via the redirect_u
CVE-2024-21495 MEDIUM 6.5 UPGRADE Versions of the package github.com/greenpau/caddy-security before 1.0.42 are vulnerable to Insecure Randomness

References

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