CVE-2026-82291

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: Elevated riskExposed: 0

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

HeyForm before 3.0.0-rc.8 reflects the request Origin header in CORS responses while allowing credentials, enabling cross-origin requests with authentication. Attackers can execute authenticated GraphQL queries from malicious pages visited by logged-in users to access workspaces, projects, forms, submissions, and respondent data, or modify account settings.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
52(Track*)
EG Risk 52/100SSVC: 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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

August 28, 2026

Last Modified

September 16, 2026

Advisory Details (5)

Auto-updated Aug 28, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic

HeyForm Reflects Any Origin in CORS Responses While Allowing Credentials | Advisories | VulnCheck

https://www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentials
generic

GitHub - heyform/heyform: Open-Source Form Builder · GitHub

https://github.com/heyform/heyform
github_commit Patch Available

commit bf9d738ca70a (heyform/heyform)

Patch available: heyform/heyform v3.0.0-rc.8 (contains commit bf9d738ca70a)

https://github.com/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b00365c5144d4
generic

heyform/packages/server/src/main.ts at v3.0.0-rc.7 · heyform/heyform · GitHub

https://github.com/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src/main.ts
github Patch Available🟡 PoC Available

Unauthenticated Cross-Origin Data Theft via CORS Wildcard Reflection with Credentials · Advisory · heyform/heyform · GitHub

https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g

Vendor Advisories for CVE-2026-82291(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 91× 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. 2026-09-18 23:18 UTCEG score recompute
  2. 2026-09-18 23:18 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 11:54 UTCGHSA enrichment
  5. 2026-09-18 00:29 UTCEG score recompute
  6. 2026-09-18 00:29 UTCGHSA enrichment
  7. 2026-09-17 13:04 UTCGHSA enrichment
  8. 2026-09-17 01:11 UTCEG score recompute
  9. 2026-09-17 01:11 UTCGHSA enrichment
  10. 2026-09-16 14:08 UTCEPSS rescore
  11. 2026-09-16 13:46 UTCGHSA enrichment
  12. 2026-09-16 05:52 UTCEG score recompute
  13. 2026-09-16 05:52 UTCGHSA enrichment
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 18:28 UTCGHSA enrichment
  16. 2026-09-15 06:14 UTCEG score recompute
  17. 2026-09-15 06:14 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-14 18:48 UTCGHSA enrichment
  21. 2026-09-14 07:23 UTCGHSA enrichment
  22. 2026-09-13 19:59 UTCEG score recompute
  23. 2026-09-13 19:59 UTCGHSA enrichment
  24. 2026-09-13 08:34 UTCGHSA enrichment
  25. 2026-09-12 21:10 UTCEG score recompute
Show 66 more
  1. 2026-09-12 21:10 UTCGHSA enrichment
  2. 2026-09-12 09:45 UTCGHSA enrichment
  3. 2026-09-11 22:21 UTCEG score recompute
  4. 2026-09-11 22:20 UTCGHSA enrichment
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 10:51 UTCEG score recompute
  8. 2026-09-11 10:51 UTCGHSA enrichment
  9. 2026-09-10 23:10 UTCGHSA enrichment
  10. 2026-09-10 11:45 UTCEG score recompute
  11. 2026-09-10 11:45 UTCGHSA enrichment
  12. 2026-09-09 23:52 UTCGHSA enrichment
  13. 2026-09-09 11:51 UTCGHSA enrichment
  14. 2026-09-09 00:27 UTCEG score recompute
  15. 2026-09-09 00:27 UTCGHSA enrichment
  16. 2026-09-08 22:01 UTCEPSS rescore
  17. 2026-09-08 11:09 UTCGHSA enrichment
  18. 2026-09-07 23:10 UTCEG score recompute
  19. 2026-09-07 23:10 UTCGHSA enrichment
  20. 2026-09-07 11:45 UTCGHSA enrichment
  21. 2026-09-07 00:20 UTCEG score recompute
  22. 2026-09-07 00:20 UTCGHSA enrichment
  23. 2026-09-06 13:48 UTCEPSS rescore
  24. 2026-09-06 12:53 UTCGHSA enrichment
  25. 2026-09-06 01:29 UTCEG score recompute
  26. 2026-09-06 01:28 UTCGHSA enrichment
  27. 2026-09-05 15:31 UTCEPSS rescore
  28. 2026-09-05 14:03 UTCGHSA enrichment
  29. 2026-09-05 02:38 UTCGHSA enrichment
  30. 2026-09-04 15:12 UTCEG score recompute
  31. 2026-09-04 15:12 UTCGHSA enrichment
  32. 2026-09-04 05:07 UTCEPSS rescore
  33. 2026-09-04 03:46 UTCGHSA enrichment
  34. 2026-09-03 16:18 UTCGHSA enrichment
  35. 2026-09-03 04:50 UTCGHSA enrichment
  36. 2026-09-02 17:20 UTCEG score recompute
  37. 2026-09-02 17:20 UTCGHSA enrichment
  38. 2026-09-02 14:12 UTCEPSS rescore
  39. 2026-09-02 05:55 UTCGHSA enrichment
  40. 2026-09-01 18:22 UTCEG score recompute
  41. 2026-09-01 18:22 UTCGHSA enrichment
  42. 2026-09-01 13:54 UTCEPSS rescore
  43. 2026-09-01 06:56 UTCEG score recompute
  44. 2026-09-01 06:56 UTCGHSA enrichment
  45. 2026-09-01 04:40 UTCEPSS rescore
  46. 2026-09-01 04:40 UTCEPSS rescore
  47. 2026-08-31 19:31 UTCEG score recompute
  48. 2026-08-31 19:31 UTCGHSA enrichment
  49. 2026-08-31 19:08 UTCEG score recompute
  50. 2026-08-31 19:07 UTCGHSA enrichment
  51. 2026-08-31 09:39 UTCGHSA enrichment
  52. 2026-08-30 22:14 UTCEG score recompute
  53. 2026-08-30 22:14 UTCGHSA enrichment
  54. 2026-08-30 19:18 UTCEPSS rescore
  55. 2026-08-30 19:17 UTCEPSS rescore
  56. 2026-08-30 10:49 UTCEG score recompute
  57. 2026-08-30 10:49 UTCGHSA enrichment
  58. 2026-08-30 01:22 UTCEPSS rescore
  59. 2026-08-29 23:23 UTCGHSA enrichment
  60. 2026-08-29 11:58 UTCEG score recompute
  61. 2026-08-29 11:58 UTCGHSA enrichment
  62. 2026-08-29 07:52 UTCEG score recompute
  63. 2026-08-29 07:51 UTCGHSA enrichment
  64. 2026-08-28 20:25 UTCEG score recompute
  65. 2026-08-28 19:39 UTCEG score recompute
  66. 2026-08-28 19:36 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82291?
CVE-2026-82291 is a high vulnerability published on August 28, 2026. HeyForm before 3.0.0-rc.8 reflects the request Origin header in CORS responses while allowing credentials, enabling cross-origin requests with authentication. Attackers can execute authenticated GraphQL queries from malicious pages visited by logged-in users to access workspaces, projects, forms,…
When was CVE-2026-82291 disclosed?
CVE-2026-82291 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82291 actively exploited?
CVE-2026-82291 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 77.1% of all scored CVEs.
What is the CVSS score of CVE-2026-82291?
CVE-2026-82291 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-82291?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82291, 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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