CVE-2016-2562: The checkHTTP function in libraries/Config.class.php in phpMyAdmin 4.5.x before 4.5.5.1 does not verify X.509

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MEDIUM 6.8REMOTEDOWNGRADE

CVE-2016-2562 is a medium-severity flaw (CVSS 6.8) affecting phpmyadmin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The checkHTTP function in libraries/Config.class.php in phpMyAdmin 4.5.x before 4.5.5.1 does not verify X.509 certificates from api.github.com SSL servers, which allows man-in-the-middle attackers to spoof these servers and obtain sensitive information via a crafted certificate.

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-20
Published	2016-03-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: phpmyadmin

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2016-03-01 11:59 UTCPublished CVE record published
2026-06-17 00:44 UTCUpdated Record last modified

phpmyadmin phpmyadmin DOWNGRADE

Affected: 4.5.0 · 4.5.0 beta1 · 4.5.0 beta2 · 4.5.0 rc1 · 4.5.0.1 · 4.5.0.2 · 4.5.1 · 4.5.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.5.0

1. Check installed version

apt-cache policy phpmyadmin || rpm -q phpmyadmin || phpmyadmin --version

2. No fixed release: DOWNGRADE to a release before 4.5.0 (Debian / Ubuntu)

apt-cache madison phpmyadmin sudo apt install phpmyadmin=<VERSION_BEFORE_4.5.0> sudo apt-mark hold phpmyadmin

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list phpmyadmin sudo dnf downgrade phpmyadmin-<VERSION_BEFORE_4.5.0> sudo dnf versionlock add phpmyadmin

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-2562?

phpmyadmin: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-2562 being exploited?

CVE-2016-2562 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-2562 affect?

CVE-2016-2562 affects phpmyadmin. Severity is medium (CVSS 6.8). The checkHTTP function in libraries/Config.class.php in phpMyAdmin 4.5.x before 4.5.5.1 does not verify X.509 certificates from api.github.com SSL servers, which allows man-in-the-middle attackers to spoof these servers and obtain sensitive

How urgent is CVE-2016-2562?

Priority 43/100. Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities · GitHub vulnerabilities · phpMyAdmin vulnerabilities

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References

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