CVE-2023-0567 - CVE House
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Status published High CVE-2023-0567

password_verify() always returns true for some invalid hashes

Vulnerability Description

In PHP 8.0.X before 8.0.28, 8.1.X before 8.1.16 and 8.2.X before 8.2.3, password_verify() function may accept some invalid Blowfish hashes as valid. If such invalid hash ever ends up in the password database, it may lead to an application allowing any password for this entry as valid.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Tim Düsterhus
  • tech at mkdgs dot fr

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Affected Vendor

Affected Software

PHP
Vulnerable Versions:
8.0.*, 8.1.*, 8.2.*

Timeline

Official Publish: February 16th, 2023
Last Modified: July 17th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.