What is CVE-2024-56156?

CVE-2024-56156 is a critical-severity vulnerability in Halo, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2025-04-25.

How severe is CVE-2024-56156?

Critical severity. CVSS v3 base score is 9.0 out of 10.

XSS in Halo

CVE-2024-56156

Halo is an open source website building tool. Prior to version 2.20.13, a vulnerability in Halo allows attackers to bypass file type validation controls. This bypass enables the upload of malicious files including executables and HTML file…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.006 (45.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

Affected products

Halo
Halo-dev Halo — versions < 2.20.13

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Issue Tracking)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2024-56156?: CVE-2024-56156 is a critical-severity vulnerability in Halo, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2025-04-25.
How severe is CVE-2024-56156?: Critical severity. CVSS v3 base score is 9.0 out of 10.