Vulnerability · Published Jun 21, 2025 · Assigned by zdi

CVE-2025-6216Allegra calculateTokenExpDate Password Recovery Authentication Bypass Vulnerability

Critical 9.8

In plain English

A critical-severity security flaw in Allegra from Allegra. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 47.8% (higher than 99% of all known vulnerabilities).

Severity (CVSS 3.0)9.8Critical

Exploit odds (30 days)47.8%top 1.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Allegra	Allegra	8.1.3.32

Weakness: CWE-640 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

ZDI-25-410 x_research-advisory
vendor-provided URL vendor-advisory