# CVE-2026-122139: blueprintUE Self-Hosted Edition before 4.3.3 Account Enumeration via Password Reset

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

blueprintUE Self-Hosted Edition before 4.3.3 contains an account enumeration vulnerability in ForgotPasswordMiddleware.php that allows unauthenticated attackers to identify registered email addresses. Attackers can compare password reset redirect targets for submitted emails, and failed lookups are never rate-limited, enabling unlimited enumeration attempts.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/45832742182a6c4438a0d58de95ba9c7686851f2
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/265

## Affected products and versions

- blueprintue / blueprintue-self-hosted-edition (blueprintue/blueprintue-self-hosted-edition): ≥ 0; < 4.3.3 (affected, 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:N/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-204

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-fwgq-c3c6-p67j (CNA: VulnCheck; vendor-advisory)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/45832742182a6c4438a0d58de95ba9c7686851f2 (CNA: VulnCheck; patch)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/265 (CNA: VulnCheck; patch, issue-tracking)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.3 (CNA: VulnCheck; release-notes)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.2/app/middlewares/ForgotPasswordMiddleware.php#L130-L157 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-before-4.3.3-account-enumeration-via-password-reset (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-122139; retrieved 2026-11-04; source updated 2026-11-04

Revision: 256530a5a70a3f362a3df143f844a1706bf47d82e1ca04fb9f63a820846d5ca9

Canonical: https://y2.dev/cve/CVE-2026-122139

## 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.