What is CVE-2023-51638?

CVE-2023-51638 is a critical-severity vulnerability in Allegra, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2024-11-22.

How severe is CVE-2023-51638?

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

Vulnerability in Allegra

CVE-2023-51638

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.

Published 2024-11-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (70.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Allegra — versions 7.5.0.24
Alltena Allegra

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

www.zerodayinitiative.com/advisories/ZDI-24-111/ (x_research-advisory, Third Party Advisory)
www.trackplus.com/en/service/release-notes-reader/7-5-1-release-notes-2.html (vendor-advisory, Release Notes)

Frequently asked questions

What is CVE-2023-51638?: CVE-2023-51638 is a critical-severity vulnerability in Allegra, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2024-11-22.
How severe is CVE-2023-51638?: Critical severity. CVSS v3 base score is 9.8 out of 10.