Vulnerability in Blueprintue Blueprintue-Self-Hosted-Edition
CVE-2026-122139
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.2/app/middlewa… (technical-description)
- github.com/blueprintue/blueprintue-self-hosted-edition/commit/45832742182a6c443… (patch)
- github.com/blueprintue/blueprintue-self-hosted-edition/pull/265 (issue-tracking, patch)
- blueprintue-self-hosted-edition v4.3.3 Release Notes (release-notes)
- GitHub Security Advisory (GHSA-fwgq-c3c6-p67j) (vendor-advisory)
- VulnCheck Advisory: blueprintUE Self-Hosted Edition before 4.3.3 Account Enumeration via Password Reset (third-party-advisory)
Frequently asked questions
- What is CVE-2026-122139?
- CVE-2026-122139 is a medium-severity vulnerability in Blueprintue Blueprintue-Self-Hosted-Edition, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-11-04.
- How severe is CVE-2026-122139?
- Medium severity. CVSS v3 base score is 5.3 out of 10.