CVE-2023-0567

password_verify() always returns true for some invalid hashes

MEDIUM

6.2

CVSS Score

Published: February 16, 2023 at 06:15 AM UTC

Updated: July 19, 2026 at 07:16 PM UTC

1 product affected across 1 vendorPHP

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Severity

MEDIUM6.2

Exploit prediction

EPSS 0.9%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PHP · PHPdrupal

95%

8.0.* ≤ v < 8.0.288.0.0 ≤ v < 8.0.288.1.* ≤ v < 8.1.168.1.0 ≤ v < 8.1.168.2.* ≤ v < 8.2.38.2.0 ≤ v < 8.2.38.0.*8.1.*8.2.*

Affected range stops below 8.0.28, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.1.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.2.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor Advisory

Source: [email protected]

https://bugs.php.net/bug.php?id=81744

ExploitVendor Advisory

Source: [email protected]

https://github.com/php/php-src/security/advisories/GHSA-7fj2-8x79-rjf4

Source: af854a3a-2127-422b-91ae-364da2661108

https://security.netapp.com/advisory/ntap-20230331-0008/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.2MEDIUM[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-916

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