# CVE-2026-118685: ToolJet 3.20.2-lts before 3.20.242-lts Signup Bypass via SignupDisableGuard

Status: published. Published: 2026-10-28. Updated: 2026-11-02.

ToolJet from 3.20.2-lts before 3.20.242-lts contains an authorization bypass in SignupDisableGuard, which treats the string signup setting 'false' as truthy, so instance-level signup restrictions are not enforced. Unauthenticated attackers can send POST requests to /api/signup without an organizationId to create an account, join the default workspace, and receive a valid session.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- ToolJet / ToolJet: ≥ 3.20.2-lts; < 3.20.242-lts (affected, semver); 3.20.242-lts (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-02; percentile 8.16%

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-863

## Exploit evidence

- exploit: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-gg3p-r4g8-vxg2 (ADP: CISA-ADP)

## References

- https://github.com/ToolJet/ToolJet/security/advisories/GHSA-gwr6-mv6v-23f2 (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/tooljet-3.20.2-lts-before-3.20.242-lts-signup-bypass-via-signupdisableguard (CNA: VulnCheck; third-party-advisory)

- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-gg3p-r4g8-vxg2 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-118685; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118685; retrieved 2026-11-02; source updated Not reported

Revision: 4cf6826f755a4d03f7c9eaf08c7a34ff488e58daab54f4d30d65e9c1f540e760

Canonical: https://y2.dev/cve/CVE-2026-118685

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.