CVE-2026-45797

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. 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, secondary
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, the /api/upload endpoint allows unauthenticated file uploads including SVG files. Uploaded SVGs are stored in the static assets directory and served with Content-Type: image/svg+xml by Express's serve-static middleware, allowing an attacker to achieve stored cross-site scripting (XSS) on the heyform domain without any authentication. Version 3.0.0-rc.7 contains a patch for the issue.

CVSS v3
6.4
EG Score
6.4(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

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
Severity64% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

July 20, 2026

Last Modified

July 22, 2026

Advisory Details (2)

Auto-updated Jul 20, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Stored XSS via Unauthenticated SVG File Upload · Advisory · heyform/heyform · GitHub

https://github.com/heyform/heyform/security/advisories/GHSA-m94h-jxvc-hhch
github_commit Patch Available

commit 144240e5545d (heyform/heyform)

Patch available: heyform/heyform v3.0.0-rc.7 (contains commit 144240e5545d)

https://github.com/heyform/heyform/commit/144240e5545d10fd9e120d05ccb402a6d7064674

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 40× 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 103 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45797?
CVE-2026-45797 is a medium vulnerability published on July 20, 2026. HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, the /api/upload endpoint allows unauthenticated file uploads including SVG files. Uploaded SVGs are stored in the static assets directory and served with Content-Type: image/svg+xml by Express's serve-static middleware, allowing…
When was CVE-2026-45797 disclosed?
CVE-2026-45797 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45797 actively exploited?
CVE-2026-45797 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.1% of all scored CVEs.
What is the CVSS score of CVE-2026-45797?
CVE-2026-45797 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-45797?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45797, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-45797

Explore →

Is Your Infrastructure Affected by CVE-2026-45797?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs