CVE-2026-39923
Password reset token expiry bypass in Flarum allows account takeover.
Is CVE-2026-39923 being exploited?
Not confirmed. CVE-2026-39923 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.26% probability of exploitation in the next 30 days.
How severe is CVE-2026-39923?
CVE-2026-39923 is rated Critical with a CVSS score of 9.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-39923?
Yes. A fix has been recorded for CVE-2026-39923. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-39923 affect?
CVE-2026-39923 affects Flarum < 1.8.16, Flarum password reset endpoint (SavePasswordController::handle). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-39923?
Upgrade to Flarum 1.8.16+, reset sensitive account passwords, enable MFA.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attackers can reuse expired password-reset tokens to change any account password and obtain authenticated sessions.
Immediate action required
- affected< 1.8.16
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.