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

Q: How do I fix CVE-2023-51638?

allegra: upgrade to 7.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2023-51638 being exploited?

CVE-2023-51638 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-51638 affect?

CVE-2023-51638 affects allegra. Severity is critical (CVSS 9.8). 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. Th

Q: How urgent is CVE-2023-51638?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2023-51638 is a critical-severity flaw (CVSS 9.8) affecting allegra. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-798
Published	2024-11-22
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: alltena

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-11-22 20:15 UTCPublished CVE record published
2026-06-17 06:41 UTCUpdated Record last modified

alltena allegra UPGRADE

Affected: < 7.5.1

Fixed in: 7.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy allegra || rpm -q allegra || allegra --version

2. UPGRADE to 7.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade allegra

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade allegra

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-51638?

allegra: upgrade to 7.5.1. Exact commands for each OS are on this page.

Is CVE-2023-51638 being exploited?

CVE-2023-51638 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-51638 affect?

CVE-2023-51638 affects allegra. Severity is critical (CVSS 9.8). 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. Th

How urgent is CVE-2023-51638?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

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CVE-2024-5581 HIGH 7.2 UPGRADE Allegra unzipFile Directory Traversal Remote Code Execution Vulnerability
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References

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