What’s Vulnerable › Vulnerabilities

CVE-2024-56156: Halo Vulnerable to Stored XSS and RCE via File Upload Bypass

• Severity: critical (CVSS 9.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-04-25 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• halo-dev halo: before 2.20.13 — fixed in 2.20.13

How to fix

Upgrade to a fixed version: halo-dev halo 2.20.13. Check the vendor advisory for mitigations.

References

• https://github.com/halo-dev/halo/commit/24f8d7b57127e2607ec05adb7c912b3decddeb99
• https://github.com/halo-dev/halo/pull/7149
• https://github.com/halo-dev/halo/security/advisories/GHSA-99mc-ch53-pqh9

Get alerted when CVE-2024-56156 or the next vulnerability affects your stack