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CRITICAL severity

CVE-2017-18264 — phpmyadmin

CRITICAL

CVE-2017-18264 is a critical-severity (CVSS 9.8) vulnerability in phpmyadmin/phpmyadmin. A fix is available for phpmyadmin/phpmyadmin — see the affected versions and patch details below.

phpMyAdmin Improper Privilege Management

Also known asGHSA-5868-g58j-vrj5
Published
Updated
Affected
4 pkgs
Patched
2 / 4
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs87th percentile — riskier than 87% of all scored CVEsHighest risk
0.00%1.27%2.53%3.80%0.3%2.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

4 pkgs affected
🐘phpmyadmin/phpmyadmin🐘phpmyadmin/phpmyadmin🐘phpmyadmin/phpmyadmin🐘phpmyadmin/phpmyadmin

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

4 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistphpmyadmin/phpmyadmin≥ 4.0&&< 4.0.10.204.0.10.20composer require phpmyadmin/phpmyadmin:^4.0.10.20
🐘Packagistphpmyadmin/phpmyadmin≥ 4.7.0-beta1&&< 4.7.04.7.0composer require phpmyadmin/phpmyadmin:^4.7.0
🐘Packagistphpmyadmin/phpmyadmin≥ 4.4.0No fix
🐘Packagistphpmyadmin/phpmyadmin≥ 4.6.0No fix

Affected Products

2 products · 6 configurations
OS
debian linuxdebian
1 version
8.0
Application
phpmyadminphpmyadmin
≥ 4.6.0 && ≤ 4.6.6
1 version
4.7.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for phpmyadmin/phpmyadmin, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update phpmyadmin/phpmyadmin to 4.0.10.20 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-18264 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2017-18264: phpmyadmin — Fixed in 4.0.10.20