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 files, which can lead to stored cross-site scripting attacks and potential remote code execution under certain circumstances. This issue has been patched in version 2.20.13.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.008 (55.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001
Affected products
- Halo
- Halo-Dev Halo — versions < 2.20.13
Weakness classification (CWE)
References
- github.com/halo-dev/halo/security/advisories/GHSA-99mc-ch53-pqh9 (Exploit, Mitigation, Vendor Advisory)
- github.com/halo-dev/halo/pull/7149 (Issue Tracking)
- github.com/halo-dev/halo/commit/24f8d7b57127e2607ec05adb7c912b3decddeb99
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.