CVE•Published 2026-05-07•Modified 2026-06-04•1 article on news•5 live references•NVD data

CVE-2026-42239Budibase · Budibase

Vulnerability data via NVD (ingested)

CVSS v3.1

8.1

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 92% of all CVEs

Weaknesses (CWE)

CWE-1004Sensitive Cookie Without 'HttpOnly' Flag

Description

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.

Timeline

Published 2026-05-07

Modified 2026-06-04

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-42239

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Budibase Budibase"

All exposed Budibase Budibase instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Budibase"

HTTP body or banner mentions "Budibase" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-42239