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Fencer Intel
critical 9.8

CVE-2017-18264 json

phpMyAdmin Improper Privilege Management

published 2018-05-01 8 y ago modified 2026-06-17 4 mo ago also GHSA-5868-g58j-vrj5 , EUVD-2022-2531

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

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.

Patch / fix

  • packagist phpmyadmin/phpmyadmin 4.0.10.20, 4.7.0
  • phpmyadmin phpmyadmin 4.0.10.20
  • phpmyadmin Debian 14, Debian 13, Debian 12 4:4.6.6-2

debian advisories DEBIAN-CVE-2017-18264

  • phpmyadmin Ubuntu Pro 14.04 LTS 4:4.0.10-1ubuntu0.1+esm4
  • phpmyadmin Ubuntu Pro 16.04 LTS 4:4.5.4.1-2ubuntu2.1+esm3

ubuntu advisories UBUNTU-CVE-2017-18264

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-18264 updated cvss 4.3

phpMyAdmin: Bypass $cfg['Servers'][$i]['AllowNoPassword']

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.82% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist phpmyadmin/phpmyadmin
>=4.0, <4.0.10.20
>=4.7.0-beta1, <4.7.0
>=4.4.0, <=4.4.15.10
>=4.6.0, <=4.6.6
4.0.10.20
4.7.0

Classification

Weakness
  • CWE-269 Improper Privilege Management

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.