CVE-2023-0567
HighCVSS 7.7Exploitation Probability (EPSS)
Elevated risk57th percentile - higher than 57% of all known CVEs
Summary
In PHP 8.0.x before 8.0.28, 8.1.x before 8.1.16, and 8.2.x before 8.2.3, the password_verify() function may accept some invalid Blowfish hashes as valid. If such an invalid hash ends up in the password database, it may allow any password for that entry to be considered valid.
Risk Assessment
The risk is that an attacker could exploit an invalid Blowfish hash in the password database to log into an account without knowing the correct password, leading to unauthorized access.
Recommendation
It is recommended to immediately upgrade PHP to version 8.0.28, 8.1.16, or 8.2.3 depending on the branch used, and to audit the password database for invalid Blowfish hashes.
Other vulnerabilities in PHP
See all- CVE-2026-13081Unknown
This CVE has been rejected. Reason: Red Hat is not the CNA for PHP. CVE was reserved in error; the appropriate CNA should assign CVE IDs for these vulnerabilities.
- CVE-2026-13047Unknown
This CVE has been rejected. Reason: Red Hat is not the CNA for PHP. CVE was reserved in error; the appropriate CNA should assign CVE IDs for these vulnerabilities.
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The object_common1 function in PHP before 5.6.30, 7.0.x before 7.0.15, and 7.1.x before 7.1.1 allows remote attackers to cause a denial of service (buffer over-read and application crash) via crafted serialized data that is mishandled in a finish_nested_data call.
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Original NVD description (English source)
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.