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Vulnerability record · CVE-2017-18264 · published 1 May 2018

CVE-2017-18264: Phpmyadmin vulnerability

Phpmyadmin · Phpmyadmin

An issue was discovered in libraries/common.inc.php in phpMyAdmin 4.0 before 4.0.10.20, 4.4.x, 4.6.x, and 4.7.0 prereleases. The restrictions caused by $cfg['Servers'][$i]['AllowNoPassword'] = false are bypassed under certain PHP versions (e.g., version 5). This can allow the login of users who have no password set even if the administrator has set $cfg['Servers'][$i]['AllowNoPassword'] to false (which is also the default). This occurs because some implementations of the PHP substr function return false when given '' as the first argument.

9.8 CVSS 3.0 Critical EPSS 2.8% · top 13.8%
9.8CVSS 3.0 base score, v2 7.5
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in libraries/common.inc.php in phpMyAdmin 4.0 before 4.0.10.20, 4.4.x, 4.6.x, and 4.7.0 prereleases. The restrictions caused by $cfg['Servers'][$i]['AllowNoPassword'] = false are bypassed under certain PHP versions (e.g., version 5). This can allow the login of users who have no password set even if the administrator has set $cfg['Servers'][$i]['AllowNoPassword'] to false (which is also the default). This occurs because some implementations of the PHP substr function return false when given '' as the first argument.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/97211 Third Party AdvisoryVDB Entry
https://lists.debian.org/debian-lts-announce/2018/07/msg00006.html Third Party Advisory
https://www.phpmyadmin.net/security/PMASA-2017-8/ PatchVendor Advisory
http://www.securityfocus.com/bid/97211 Third Party AdvisoryVDB Entry
https://lists.debian.org/debian-lts-announce/2018/07/msg00006.html Third Party Advisory
https://www.phpmyadmin.net/security/PMASA-2017-8/ PatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-18264), CISA KEV, FIRST EPSS (scores of 2026-10-01). This page is refreshed as NVD updates the record.