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CVE-2023-51638: Allegra Hard-coded Credentials Authentication Bypass Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-22 · updated 2026-06-17
• Weakness: CWE-798

Description

Allegra Hard-coded Credentials 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 configuration of a database. The issue results from the use of a hardcoded password. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-22360.

Affected products

• Allegra: before 7.5.1 — fixed in 7.5.1

How to fix

Upgrade to a fixed version: Allegra 7.5.1. Check the vendor advisory for mitigations.

References

• https://www.trackplus.com/en/service/release-notes-reader/7-5-1-release-notes-2.html
• https://www.zerodayinitiative.com/advisories/ZDI-24-111/

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