Read the docs
TI-2026-30560 Aliases CVE-2026-42239GHSA-4f9j-vr4p-642r

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

Priority HIGH 70CWE-1004Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00283 20th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed budibase (Budibase): 3.35.10@budibase/backend-core (npm): 3.35.10

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Budibasebudibasebefore 3.35.103.35.10Patch availableCNA
—@budibase/backend-core (npm)before 3.35.103.35.10Patch availableGHSA-4f9j-vr4p-642r
  • budibase VendorBudibase Affected before 3.35.10 Fixed in 3.35.10 Patch available CNA
  • @budibase/backend-core (npm) Vendor— Affected before 3.35.10 Fixed in 3.35.10 Patch available GHSA-4f9j-vr4p-642r

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:budibase:budibase:*:*:*:*:*:*:*:*before 3.35.10VulnerableBudibase
  • cpe:2.3:a:budibase:budibase:*:*:*:*:*:*:*:* Versions before 3.35.10 Vulnerable ·Budibase

Remediation

  • Fix · CNA budibase (Budibase) Fixed in 3.35.10
  • Fix · GHSA-4f9j-vr4p-642r @budibase/backend-core (npm) Fixed in 3.35.10 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42239
  2. 2026-10-03 Alias added: GHSA-4f9j-vr4p-642r

References

Exploit 1

Patch 1

Advisory 1

Other 1

  • TI-2026-39242 Budibase: Anonymous NoSQL operator injection via published-app query templates CVSS 3.1CRITICAL 10.0
  • TI-2026-24369 Budibase Universal Auth Bypass via Webhook Query Param Injection CVSS 3.1CRITICAL 9.1
  • TI-2026-39244 Budibase: Arbitrary file read by workspace-builder via PWA-zip symlink upload CVSS 3.1CRITICAL 9.6
  • TI-2026-39243 Budibase: Mass Assignment in Webhook Trigger Allows Cross-Workspace Automation Execution via appId Override CVSS 3.1CRITICAL 9.6
  • TI-2026-24371 Budibase: Server-Side Request Forgery via REST Connector with Empty Default Blacklist CVSS 3.1CRITICAL 9.9
  • TI-2026-23473 Budibase PWA ZIP Upload Path Traversal Allows Reading Arbitrary Server Files Including All Environment Secrets CVSS 3.1CRITICAL 9.6
See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences