CVE-2026-35198

CRITICALPre-NVD 9.09.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This critical-severity CVE scores 9.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
9.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.0Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

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
9.0CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

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 (value × EchelonGraph’s weight)
Severity90% × 45%
The EG Score, 9.0 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 20, 2026

Last Modified

August 21, 2026

Advisory Details (2)

Auto-updated Jul 20, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

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 13× in last 7d / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 143 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 44 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 09:43 UTCEG score recompute
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-13 07:29 UTCEG score recompute
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-12 16:12 UTCEG score recompute
  6. 2026-10-11 19:54 UTCEG score recompute
  7. 2026-10-11 17:07 UTCEG score recompute
  8. 2026-10-11 14:34 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-10-04 14:56 UTCEG score recompute
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-10-01 07:43 UTCEG score recompute
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-09-28 06:22 UTCEG score recompute
  24. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 74 more
  1. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-09-24 03:29 UTCEG score recompute
  3. 2026-09-23 01:43 UTCEG score recompute
  4. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-09-18 03:58 UTCEG score recompute
  7. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-09-17 05:14 UTCEG score recompute
  9. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-09-16 12:48 UTCEG score recompute
  11. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-09-13 22:51 UTCEG score recompute
  14. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-09-12 19:30 UTCEG score recompute
  16. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-09-11 18:32 UTCEG score recompute
  18. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-09-11 09:28 UTCEG score recompute
  21. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-09-09 11:56 UTCEG score recompute
  23. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-09-07 22:55 UTCEG score recompute
  25. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  26. 2026-09-06 15:56 UTCEG score recompute
  27. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  28. 2026-09-05 19:52 UTCEG score recompute
  29. 2026-09-05 09:33 UTCEG score recompute
  30. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  31. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  32. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  33. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  34. 2026-08-30 19:41 UTCEG score recompute
  35. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  36. 2026-08-30 02:37 UTCEG score recompute
  37. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  38. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  39. 2026-08-27 21:20 UTCEG score recompute
  40. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  41. 2026-08-26 22:09 UTCEG score recompute
  42. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  43. 2026-08-25 15:47 UTCEG score recompute
  44. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  45. 2026-08-24 18:58 UTCEG score recompute
  46. 2026-08-24 12:15 UTCEG score recompute
  47. 2026-08-23 01:42 UTCEG score recompute
  48. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  49. 2026-08-22 00:33 UTCEG score recompute
  50. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  51. 2026-08-21 20:23 UTCEG score recompute
  52. 2026-08-21 20:10 UTCEG score recompute
  53. 2026-08-20 23:54 UTCEG score recompute
  54. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  55. 2026-08-19 22:50 UTCEG score recompute
  56. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  57. 2026-08-18 19:36 UTCEG score recompute
  58. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  59. 2026-08-17 15:23 UTCEG score recompute
  60. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  61. 2026-08-16 18:34 UTCEG score recompute
  62. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  63. 2026-08-16 06:05 UTCEG score recompute
  64. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  65. 2026-08-15 05:06 UTCEG score recompute
  66. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  67. 2026-08-13 23:59 UTCEG score recompute
  68. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  69. 2026-08-12 14:13 UTCEG score recompute
  70. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  71. 2026-08-11 17:25 UTCEG score recompute
  72. 2026-08-11 00:36 UTCEG score recompute
  73. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  74. 2026-08-09 15:19 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-35198?
CVE-2026-35198 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-35198 published?
The CVE record for CVE-2026-35198 was published on July 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 21, 2026; the record at its source may have been updated since.
Is CVE-2026-35198 actively exploited?
CVE-2026-35198 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-35198?
CVE-2026-35198 has a CVSS base score of 9.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-35198?
A fix for CVE-2026-35198 is available: update to the fixed version the vendor names in its advisory.

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