What is CVE-2026-42239?

CVE-2026-42239 is a high-severity vulnerability in Budibase, classified under Sensitive Cookie Without 'HttpOnly' Flag. CVSS score: 8.1/10. Published 2026-05-07.

How severe is CVE-2026-42239?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Budibase

CVE-2026-42239

Budibase is an open-source low-code platform. Prior to version 3.35.10, the budibase:auth cookie containing the JWT session token is set with httpOnly: false at packages/backend-core/src/utils/utils.ts:218. JavaScript can read this cookie…

EPSS: 0.000 (8.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N.

Affected products

Budibase — versions < 3.35.10

Weakness classification (CWE)

CWE-1004 — Sensitive Cookie Without 'HttpOnly' Flag

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-42239?: CVE-2026-42239 is a high-severity vulnerability in Budibase, classified under Sensitive Cookie Without 'HttpOnly' Flag. CVSS score: 8.1/10. Published 2026-05-07.
How severe is CVE-2026-42239?: High severity. CVSS v3 base score is 8.1 out of 10.