CVE-2015-6830: libraries/plugins/auth/AuthenticationCookie.class.php in phpMyAdmin 4.3.x before 4.3.13.2 and 4.4.x before 4.4

This week

MEDIUM 5.0DOWNGRADE

CVE-2015-6830 is a medium-severity flaw (CVSS 5.0) affecting phpmyadmin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libraries/plugins/auth/AuthenticationCookie.class.php in phpMyAdmin 4.3.x before 4.3.13.2 and 4.4.x before 4.4.14.1 allows remote attackers to bypass a multiple-reCaptcha protection mechanism against brute-force credential guessing by providing a correct response to a single reCaptcha.

Why this priority

EPSS top 4%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	10.4% (top 4%)
CISA exploited list	No
Weakness	CWE-200
Published	2015-09-14
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

2015-09-14 01:59 UTCPublished CVE record published
2026-06-17 00:31 UTCUpdated Record last modified

phpmyadmin phpmyadmin DOWNGRADE

Affected: 4.3.0 · 4.3.1 · 4.3.2 · 4.3.3 · 4.3.4 · 4.3.5 · 4.3.6 · 4.3.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.3.0 (Debian / Ubuntu)

apt-cache madison phpmyadmin sudo apt install phpmyadmin=<VERSION_BEFORE_4.3.0> sudo apt-mark hold phpmyadmin

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

dnf --showduplicates list phpmyadmin sudo dnf downgrade phpmyadmin-<VERSION_BEFORE_4.3.0> 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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: PHPMyAdmin 3.0 - Bruteforce Login Bypass

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-2015-6830?

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

Is CVE-2015-6830 being exploited?

CVE-2015-6830 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-2015-6830 affect?

CVE-2015-6830 affects phpmyadmin. Severity is medium (CVSS 5.0). libraries/plugins/auth/AuthenticationCookie.class.php in phpMyAdmin 4.3.x before 4.3.13.2 and 4.4.x before 4.4.14.1 allows remote attackers to bypass a multiple-reCaptcha protection mechanism against brute-force credential guessing by provi

How urgent is CVE-2015-6830?

Priority 46/100. EPSS top 4%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities · phpMyAdmin vulnerabilities

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References

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