CVE-2026-82291: heyform heyform

HeyForm Reflects Any Origin in CORS Responses While Allowing Credentials

CVSS 8.1 HighEPSS 0.0055 · 46th percentile

Published by the CVE Program (CNA: VulnCheck) at 28 Aug 2026, 16:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
heyform	heyform	affected before 3.0.0-rc.8 semver Other versions: unaffected

Identifiers

CVE-2026-82291

CNA

VulnCheck

Weakness (CWE)

CWE-942

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.1	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0055, the 46th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 28 Aug 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g vendor-advisory
github.com/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src/main.ts technical-description
github.com/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b00365c5144d4 patch
github.com/heyform/heyform product
www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentials third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.