CVE-2026-82291

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.55% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 45.9% of scored records. A rank, not a probability.

NVD base score

8.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

NVD analysis status

Deferred. NVD last modified this record on 2026-09-16.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-28 16:19Z2 MO AGO

Last updated

2026-09-24 14:20Z1 MO AGO

Reserved

2026-08-28

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 8.1)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Weaknesses

• CWE-942Permissive Cross-domain Security Policy with Untrusted DomainsVariant

Data version

5.2

Document digest

91d393c639d58a4194d3f476647f53691e5563c4b2d84385e88c14d985e72526

• github.comGitHub Security Advisory (GHSA-fg7j-rmgr-rc9g)https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9gvendor-advisory
• github.comVulnerable code: main.tshttps://github.com/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src/main.tstechnical-description
• github.comFix commithttps://github.com/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b00365c5144d4patch
• github.comhttps://github.com/heyform/heyformproduct
• www.vulncheck.comVulnCheck Advisory: HeyForm Reflects Any Origin in CORS Responses While Allowing Credentialshttps://www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentialsthird-party-advisory