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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-42239

32
FAUCET Score

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.

First published: May 7, 2026Last modified: May 7, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 3.35.10CPE matchmatch criteria
cpe:2.3:a:budibase:budibase:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.7
Impact Score
5.8
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.28%
Probability of exploitation in next 30 days
EPSS Percentile
20.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0028 is in the 16th percentile among its peer group of 147 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.4 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: @budibase/backend-coreFixed in: 3.35.10

Vendor Advisories (1)

npmGHSA-4f9j-vr4p-642rhigh

Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full account takeover

Apr 24, 2026

References

github.com / Budibase/budibase/releases/tag/3.35.10
PatchRelease Notes
github.com / Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r
ExploitMitigationVendor Advisory