CVE-2026-35198

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 60% 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
Elevated
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%CVSS: 9.0Exploit: Elevated riskExposed: 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, a stored cross-site scripting (XSS) vulnerability in the form builder allows a low-privileged team member to inject malicious JavaScript that executes when a team owner views the form, leading to complete account takeover through privilege escalation. Version 3.0.0-rc.7 contains a patch for the issue.

CVSS v3
9.0
EG Score
9.0(medium)
EG Risk
57(Track*)
EG Risk 57/100SSVC: 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
Severity90% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

July 20, 2026

Last Modified

August 21, 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 form field titles · Advisory · heyform/heyform · GitHub

https://github.com/heyform/heyform/security/advisories/GHSA-chmm-jqpm-3pwx
github_commit Patch Available

commit cc97d27a57ae (heyform/heyform)

Patch available: heyform/heyform v3.0.0-rc.7 (contains commit cc97d27a57ae)

https://github.com/heyform/heyform/commit/cc97d27a57ae400fec23abf5dcf6f9533c3b5db3

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 57× 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.

  1. 2026-08-30 02:37 UTCEG score recompute
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-28 21:41 UTCEPSS rescore
  4. 2026-08-27 21:20 UTCEG score recompute
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-26 22:09 UTCEG score recompute
  7. 2026-08-26 14:46 UTCEPSS rescore
  8. 2026-08-25 15:47 UTCEG score recompute
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-24 18:58 UTCEG score recompute
  11. 2026-08-24 12:15 UTCEG score recompute
  12. 2026-08-23 01:42 UTCEG score recompute
  13. 2026-08-23 00:19 UTCEPSS rescore
  14. 2026-08-22 00:33 UTCEG score recompute
  15. 2026-08-21 23:49 UTCEPSS rescore
  16. 2026-08-21 20:23 UTCEG score recompute
  17. 2026-08-21 20:10 UTCEG score recompute
  18. 2026-08-20 23:54 UTCEG score recompute
  19. 2026-08-20 22:55 UTCEPSS rescore
  20. 2026-08-19 22:50 UTCEG score recompute
  21. 2026-08-19 17:03 UTCEPSS rescore
  22. 2026-08-18 19:36 UTCEG score recompute
  23. 2026-08-18 13:48 UTCEPSS rescore
  24. 2026-08-17 15:23 UTCEG score recompute
  25. 2026-08-17 13:47 UTCEPSS rescore
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  1. 2026-08-16 18:34 UTCEG score recompute
  2. 2026-08-16 14:56 UTCEPSS rescore
  3. 2026-08-16 06:05 UTCEG score recompute
  4. 2026-08-16 02:14 UTCEPSS rescore
  5. 2026-08-15 05:06 UTCEG score recompute
  6. 2026-08-15 01:30 UTCEPSS rescore
  7. 2026-08-13 23:59 UTCEG score recompute
  8. 2026-08-13 22:00 UTCEPSS rescore
  9. 2026-08-12 14:13 UTCEG score recompute
  10. 2026-08-12 13:50 UTCEPSS rescore
  11. 2026-08-11 17:25 UTCEG score recompute
  12. 2026-08-11 00:36 UTCEG score recompute
  13. 2026-08-11 00:00 UTCEPSS rescore
  14. 2026-08-09 15:19 UTCEG score recompute
  15. 2026-08-09 13:46 UTCEPSS rescore
  16. 2026-08-08 18:31 UTCEG score recompute
  17. 2026-08-08 16:37 UTCEPSS rescore
  18. 2026-08-07 17:33 UTCEG score recompute
  19. 2026-08-06 16:35 UTCEG score recompute
  20. 2026-08-06 13:46 UTCEPSS rescore
  21. 2026-08-05 19:43 UTCEG score recompute
  22. 2026-08-05 19:17 UTCEPSS rescore
  23. 2026-08-04 18:30 UTCEG score recompute
  24. 2026-08-04 15:10 UTCEPSS rescore
  25. 2026-08-04 14:20 UTCEG score recompute
  26. 2026-08-04 10:38 UTCEPSS rescore
  27. 2026-08-03 13:21 UTCEG score recompute
  28. 2026-08-03 10:36 UTCEPSS rescore
  29. 2026-08-02 04:02 UTCEG score recompute
  30. 2026-08-02 02:27 UTCEPSS rescore
  31. 2026-08-01 07:12 UTCEG score recompute
  32. 2026-08-01 04:16 UTCEPSS rescore
  33. 2026-07-30 21:23 UTCEG score recompute
  34. 2026-07-30 16:28 UTCEPSS rescore
  35. 2026-07-30 12:13 UTCEG score recompute
  36. 2026-07-30 02:30 UTCEG score recompute
  37. 2026-07-30 01:30 UTCEPSS rescore
  38. 2026-07-28 17:03 UTCEG score recompute
  39. 2026-07-27 16:02 UTCEG score recompute
  40. 2026-07-27 14:13 UTCEPSS rescore
  41. 2026-07-26 14:57 UTCEG score recompute
  42. 2026-07-26 14:54 UTCEPSS rescore
  43. 2026-07-26 14:54 UTCEPSS rescore
  44. 2026-07-26 10:47 UTCEG score recompute
  45. 2026-07-25 14:18 UTCEPSS rescore
  46. 2026-07-25 14:18 UTCEPSS rescore
  47. 2026-07-24 14:17 UTCEPSS rescore
  48. 2026-07-24 14:17 UTCEPSS rescore
  49. 2026-07-23 14:18 UTCEPSS rescore
  50. 2026-07-23 14:18 UTCEPSS rescore
  51. 2026-07-23 03:10 UTCEG score recompute
  52. 2026-07-22 23:37 UTCEG score recompute
  53. 2026-07-22 14:08 UTCEPSS rescore
  54. 2026-07-21 15:24 UTCEPSS rescore
  55. 2026-07-20 19:27 UTCEG score recompute
  56. 2026-07-20 16:37 UTCEG score recompute
  57. 2026-07-20 16:03 UTCEG score recompute
  58. 2026-07-20 16:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-35198?
CVE-2026-35198 is a critical vulnerability published on July 20, 2026. HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, a stored cross-site scripting (XSS) vulnerability in the form builder allows a low-privileged team member to inject malicious JavaScript that executes when a team owner views the form, leading to complete account takeover through…
When was CVE-2026-35198 disclosed?
CVE-2026-35198 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-35198 actively exploited?
CVE-2026-35198 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 60.0% of all scored CVEs.
What is the CVSS score of CVE-2026-35198?
CVE-2026-35198 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-35198?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-35198, 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

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