Vulnerability in Blueprintue Blueprintue-Self-Hosted-Edition
CVE-2026-121735
blueprintUE self-hosted edition before 4.3.4 contains an insufficient session expiration vulnerability that allows attackers to confirm accounts using stale tokens because UserModel::findUserIDWithConfirmedToken ignores confirmed_sent_at. Attackers who obtain an old confirmation link from a compromised mailbox, backup, or forwarded mail can activate unconfirmed accounts and evade the unconfirmed-account cleanup job.
Published .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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/commit/8bba1615bf76b144a… (patch)
- github.com/blueprintue/blueprintue-self-hosted-edition (product)
- github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA… (vendor-advisory)
- github.com/blueprintue/blueprintue-self-hosted-edition/pull/266 (issue-tracking, patch)
- github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.3/app/models/U… (technical-description)
- github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.4 (release-notes)
- www.vulncheck.com/advisories/blueprintue-self-hosted-edition-before-4.3.4-non-e… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121735?
- CVE-2026-121735 is a low-severity vulnerability in Blueprintue Blueprintue-Self-Hosted-Edition, classified under Insufficient Session Expiration. CVSS score: 3.7/10. Published 2026-11-03.
- How severe is CVE-2026-121735?
- Low severity. CVSS v3 base score is 3.7 out of 10.