CVE-2024-56156

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under NVD CVSS v3. EPSS exploit probability: 0.8% (55th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 9.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
9.0
EG Score
9.0CRITICALmedium confidence
EG Risk
41
EG Risk 41/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.8%
EPSS %ILE
55th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

April 25, 2025

Last Modified

February 3, 2026

Advisory Details (3)

Auto-updated Jul 25, 2026
Patch available. Sources: github_pr, github, github_commit.
githubMentions a patch (unverified)

Halo Security Advisory: File Upload Bypass Leading to Stored XSS and RCE · Advisory · halo-dev/halo · GitHub

https://github.com/halo-dev/halo/security/advisories/GHSA-99mc-ch53-pqh9
github_pr Patch Available

fix: XSS vulnerability due to polyglot file type upload

Patch available: halo-dev/halo v2.22.1 (PR #7149 merged 2025-01-03)

https://github.com/halo-dev/halo/pull/7149
github_commit Patch Available

commit 24f8d7b57127 (halo-dev/halo)

Patch available: halo-dev/halo v2.22.1 (contains commit 24f8d7b57127)

https://github.com/halo-dev/halo/commit/24f8d7b57127e2607ec05adb7c912b3decddeb99

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 173 total refreshes for this CVE.

  1. 2026-10-10 19:58 UTCEPSS rescore
  2. 2026-10-09 20:05 UTCEPSS rescore
  3. 2026-10-08 17:08 UTCEPSS rescore
  4. 2026-10-07 23:46 UTCEPSS rescore
  5. 2026-10-06 15:16 UTCEPSS rescore
  6. 2026-10-05 17:41 UTCEPSS rescore
  7. 2026-10-04 23:20 UTCEPSS rescore
  8. 2026-10-03 14:24 UTCEPSS rescore
  9. 2026-10-02 16:40 UTCOSV refresh
  10. 2026-10-02 16:24 UTCEG score recompute
  11. 2026-10-01 19:48 UTCEPSS rescore
  12. 2026-09-30 15:02 UTCEPSS rescore
  13. 2026-09-30 15:02 UTCEPSS rescore
  14. 2026-09-28 13:50 UTCEPSS rescore
  15. 2026-09-27 13:44 UTCEPSS rescore
  16. 2026-09-27 13:44 UTCEPSS rescore
  17. 2026-09-26 15:57 UTCEPSS rescore
  18. 2026-09-24 14:01 UTCEPSS rescore
  19. 2026-09-23 13:46 UTCEPSS rescore
  20. 2026-09-22 14:47 UTCEPSS rescore
  21. 2026-09-20 20:14 UTCEPSS rescore
  22. 2026-09-20 20:14 UTCEPSS rescore
  23. 2026-09-18 19:26 UTCEPSS rescore
  24. 2026-09-16 14:06 UTCEPSS rescore
  25. 2026-09-16 14:06 UTCEPSS rescore
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  1. 2026-09-16 05:12 UTCEPSS rescore
  2. 2026-09-15 03:08 UTCEPSS rescore
  3. 2026-09-13 16:45 UTCEPSS rescore
  4. 2026-09-13 14:13 UTCOSV refresh
  5. 2026-09-12 14:59 UTCEPSS rescore
  6. 2026-09-11 14:51 UTCEPSS rescore
  7. 2026-09-11 09:35 UTCEPSS rescore
  8. 2026-09-10 09:33 UTCEPSS rescore
  9. 2026-09-08 21:59 UTCEPSS rescore
  10. 2026-09-07 16:00 UTCEPSS rescore
  11. 2026-09-06 13:46 UTCEPSS rescore
  12. 2026-09-04 13:59 UTCEPSS rescore
  13. 2026-09-04 05:05 UTCEPSS rescore
  14. 2026-09-02 14:10 UTCEPSS rescore
  15. 2026-09-01 13:52 UTCEPSS rescore
  16. 2026-08-30 19:16 UTCEPSS rescore
  17. 2026-08-30 19:16 UTCEPSS rescore
  18. 2026-08-30 01:21 UTCEPSS rescore
  19. 2026-08-28 21:39 UTCEPSS rescore
  20. 2026-08-27 14:24 UTCEPSS rescore
  21. 2026-08-26 14:44 UTCEPSS rescore
  22. 2026-08-25 15:39 UTCOSV refresh
  23. 2026-08-25 13:47 UTCEPSS rescore
  24. 2026-08-24 14:15 UTCEPSS rescore
  25. 2026-08-23 00:18 UTCEPSS rescore
  26. 2026-08-21 23:47 UTCEPSS rescore
  27. 2026-08-20 22:54 UTCEPSS rescore
  28. 2026-08-19 17:02 UTCEPSS rescore
  29. 2026-08-18 13:47 UTCEPSS rescore
  30. 2026-08-17 13:45 UTCEPSS rescore
  31. 2026-08-16 14:55 UTCEPSS rescore
  32. 2026-08-16 02:13 UTCEPSS rescore
  33. 2026-08-15 01:29 UTCEPSS rescore
  34. 2026-08-13 21:59 UTCEPSS rescore
  35. 2026-08-12 13:49 UTCEPSS rescore
  36. 2026-08-11 13:41 UTCEPSS rescore
  37. 2026-08-10 23:58 UTCEPSS rescore
  38. 2026-08-09 13:45 UTCEPSS rescore
  39. 2026-08-09 07:27 UTCOSV refresh
  40. 2026-08-08 16:35 UTCEPSS rescore
  41. 2026-08-07 16:26 UTCEPSS rescore
  42. 2026-08-06 13:45 UTCEPSS rescore
  43. 2026-08-05 19:16 UTCEPSS rescore
  44. 2026-08-04 15:08 UTCEPSS rescore
  45. 2026-08-03 10:35 UTCEPSS rescore
  46. 2026-08-02 02:25 UTCEPSS rescore
  47. 2026-08-02 02:25 UTCEPSS rescore
  48. 2026-08-01 04:14 UTCEPSS rescore
  49. 2026-07-30 16:26 UTCEPSS rescore
  50. 2026-07-30 16:26 UTCEPSS rescore
  51. 2026-07-30 01:29 UTCEPSS rescore
  52. 2026-07-28 15:35 UTCEPSS rescore
  53. 2026-07-26 14:53 UTCEPSS rescore
  54. 2026-07-25 14:17 UTCEPSS rescore
  55. 2026-07-25 14:17 UTCEPSS rescore
  56. 2026-07-24 14:16 UTCEPSS rescore
  57. 2026-07-24 08:11 UTCOSV refresh
  58. 2026-07-23 14:17 UTCEPSS rescore
  59. 2026-07-23 14:17 UTCEPSS rescore
  60. 2026-07-23 02:44 UTCEG score recompute
  61. 2026-07-22 14:07 UTCEPSS rescore
  62. 2026-07-21 15:23 UTCEPSS rescore
  63. 2026-07-20 17:07 UTCEPSS rescore
  64. 2026-07-19 14:30 UTCEPSS rescore
  65. 2026-07-19 14:30 UTCEPSS rescore
  66. 2026-07-19 02:28 UTCEPSS rescore
  67. 2026-07-19 02:28 UTCEPSS rescore
  68. 2026-07-18 10:03 UTCEPSS rescore
  69. 2026-07-16 17:02 UTCEPSS rescore
  70. 2026-07-15 16:57 UTCEPSS rescore
  71. 2026-07-15 01:59 UTCEPSS rescore
  72. 2026-07-15 01:59 UTCEPSS rescore
  73. 2026-07-13 22:29 UTCEPSS rescore
  74. 2026-07-13 06:12 UTCEPSS rescore
  75. 2026-07-12 05:45 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2024-56156?
CVE-2024-56156 is a critical vulnerability published on April 25, 2025. 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…
When was CVE-2024-56156 disclosed?
CVE-2024-56156 was first published on April 25, 2025, with the most recent update on February 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-56156 actively exploited?
CVE-2024-56156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (55th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2024-56156?
CVE-2024-56156 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2024-56156?
A fix for CVE-2024-56156 is available: update to the fixed version the vendor names in its advisory.

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