budibase up to 3.35.9 utils.ts budibase:auth cookie httponly flag

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in budibase up to 3.35.9. It has been declared as problematic. This issue affects the function budibase:auth of the file packages/backend-core/src/utils/utils.ts. Executing a manipulation can lead to cookie httponly flag. This vulnerability appears as CVE-2026-42239. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in budibase up to 3.35.9 and classified as problematic. This vulnerability affects the function budibase:auth of the file packages/backend-core/src/utils/utils.ts. The manipulation with an unknown input leads to a cookie httponly flag vulnerability. The CWE definition for the vulnerability is CWE-1004. The product uses a cookie to store sensitive information, but the cookie is not marked with the HttpOnly flag. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-42239 since 04/25/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

Upgrading to version 3.35.10 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202605-1457) and CERT Bund (WID-SEC-2026-1412). Once again VulDB remains the best source for vulnerability data.

Affected

  • Open Source Budibase

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.1
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cookie httponly flag
CWE: CWE-1004 / CWE-732 / CWE-275
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: budibase 3.35.10

Timelineinfo

04/25/2026 CVE reserved
05/07/2026 +12 days Advisory disclosed
05/07/2026 +0 days VulDB entry created
05/11/2026 +4 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-4f9j-vr4p-642r
Status: Confirmed

CVE: CVE-2026-42239 (🔒)
GCVE (CVE): GCVE-0-2026-42239
GCVE (VulDB): GCVE-100-361948
CERT Bund: WID-SEC-2026-1412 - Budibase: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen und potenziell Privilegieneskalation
CNNVD: CNNVD-202605-1457 - Budibase 安全漏洞

Entryinfo

Created: 05/07/2026 22:32
Updated: 05/11/2026 08:06
Changes: 05/07/2026 22:32 (66), 05/08/2026 19:04 (6), 05/11/2026 08:06 (7)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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