PatchTheCVECVE-2024-56156: Halo is an open source website building tool
CVE-2024-56156 is a critical-severity flaw (CVSS 9.0) affecting halo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.0 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.8% (top 43%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2025-04-25 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2024-56156?
halo: upgrade to 2.20.13. Exact commands for each OS are on this page.
Is CVE-2024-56156 being exploited?
CVE-2024-56156 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-2024-56156 affect?
CVE-2024-56156 affects halo. Severity is critical (CVSS 9.0). 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
How urgent is CVE-2024-56156?
Priority 51/100. Critical severity; Public exploit reference
Related CVEs
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- CVE-2025-15141 LOW 3.1 UPGRADE A vulnerability was determined in Halo up to 2.21.10
- CVE-2025-70886 HIGH 7.5 UPGRADE An issue in halo v.2.22.4 and before allows a remote attacker to cause a denial of service via a crafted paylo
- CVE-2025-44595 MEDIUM 6.1 UPGRADE Halo v2.20.17 and before is vulnerable to Cross Site Scripting (XSS) in /halo_host/archives/{name}.
- CVE-2025-44594 CRITICAL 9.1 UPGRADE halo v2.20.17 and before is vulnerable to server-side request forgery (SSRF) in /apis/uc.api.storage.halo.run/