CVE-2026-82291 (CVSS 8.1)

Description

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.

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CVSS v3.1 Score

8.1

HIGH

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

EPSS — Exploit Prediction

0.0030

Probability of exploitation

0.23%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-942 CWE-942

References

Other References

https://github.com/heyform/heyform https://github.com/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src/main.ts https://github.com/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b00365c5144d4 https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g https://www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentials https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g

Frequently Asked Questions

What is CVE-2026-82291? +

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-82291? +

CVE-2026-82291 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0030, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-82291? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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