CVE-2026-42239: Budibase is an open-source low-code platform

Q: How do I fix CVE-2026-42239?

budibase: upgrade to 3.35.10. Exact commands for each OS are on this page.

Q: Is CVE-2026-42239 being exploited?

CVE-2026-42239 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42239 affect?

CVE-2026-42239 affects budibase. Severity is high (CVSS 8.1). 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 v

Q: How urgent is CVE-2026-42239?

Priority 39/100. High severity; Public exploit reference

Routine

HIGH 8.1UPGRADE

CVE-2026-42239 is a high-severity flaw (CVSS 8.1) affecting budibase. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-1004
Published	2026-05-07
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: budibase

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-07 20:16 UTCPublished CVE record published
2026-06-17 10:47 UTCUpdated Record last modified

budibase budibase UPGRADE

Affected: < 3.35.10

Fixed in: 3.35.10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy budibase || rpm -q budibase || budibase --version

2. UPGRADE to 3.35.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade budibase

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade budibase

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42239?

budibase: upgrade to 3.35.10. Exact commands for each OS are on this page.

Is CVE-2026-42239 being exploited?

CVE-2026-42239 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42239 affect?

CVE-2026-42239 affects budibase. Severity is high (CVSS 8.1). 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 v

How urgent is CVE-2026-42239?

Priority 39/100. High severity; Public exploit reference

Related CVEs

CVE-2026-33226 HIGH 8.7 UPGRADE Budibase is a low code platform for creating internal tools, workflows, and admin panels
CVE-2026-35216 CRITICAL 9.0 UPGRADE Budibase is an open-source low-code platform
CVE-2026-35214 HIGH 8.7 UPGRADE Budibase is an open-source low-code platform
CVE-2026-31818 CRITICAL 9.6 UPGRADE Budibase is an open-source low-code platform
CVE-2026-25044 HIGH 8.8 UPGRADE Budibase is an open-source low-code platform

References

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