CVE-2026-82291 json
HeyForm Reflects Any Origin in CORS Responses While Allowing Credentials
published 2026-08-28 2 mo ago modified 2026-09-24 46 d ago also EUVD-2026-67822
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 46%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
Affected products
- heyform heyform
Classification
- Weakness
-
- CWE-942 Permissive Cross-domain Security Policy with Untrusted Domains
References
-
github.com
/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b00365c5144d4
patch
-
github.com
/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g
vendor-advisory, exploit
-
github.com
/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src/main.ts
technical-description
-
github.com
/heyform/heyform
product
-
vulncheck.com
/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentials
third-party-advisory
Sources
- CVE List CVE-2026-82291
- NVD CVE-2026-82291
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.