CVE-2026-42239

HIGH 8.1EPSS 0.3%

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 via document.cookie. This means every XSS becomes a full account takeover — the attacker steals the JWT and has persistent access to the victim's account. The cookie also lacks secure: true (sent over plaintext HTTP) and sameSite attribute. This issue has been patched in version 3.35.10.

CVSS v3.1: 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
CVSS v3.1: 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
EPSS: 0.28% chance of exploitation in the next 30 days, 20th percentile
Published: 2026-05-07

Proof-of-concept exploits (1)

advisories/GHSA-4f9j-vr4p-642r

References

CVE Record
NVD entry

CVE-2026-42239

Proof-of-concept exploits (1)

References

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