Is CVE-2026-121735 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-121735?

CVE-2026-121735 has a CVSS v3 severity of LOW (3.7).

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CVE-2026-121735

Description

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.