What is CVE-2025-6216?

CVE-2025-6216 is a critical-severity vulnerability in Allegra, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 9.8/10. Published 2025-06-21.

How severe is CVE-2025-6216?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Allegra

CVE-2025-6216

Allegra calculateTokenExpDate Password Recovery Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Allegra. Authentication is not required to exploit this vulnerability. The specific flaw exists within the password recovery mechanism. The issue results from reliance upon a predictable value when generating a password reset token. An attacker can leverage this vulnerability to bypass authentication on the application. Was ZDI-CAN-27104.

EPSS: 0.329 (98.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Allegra — versions 8.1.3.32
Alltena Allegra

Weakness classification (CWE)

CWE-640 — Weak Password Recovery Mechanism for Forgotten Password

References

zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
zdi-disclosures@trendmicro.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-6216?: CVE-2025-6216 is a critical-severity vulnerability in Allegra, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 9.8/10. Published 2025-06-21.
How severe is CVE-2025-6216?: Critical severity. CVSS v3 base score is 9.8 out of 10.