How severe is CVE-2020-26934?

CVE-2020-26934 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2020-26934?

CVE-2020-26934 affects the following packages: phpmyadmin/phpmyadmin (Packagist), phpmyadmin/phpmyadmin (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2020-26934?

Update phpmyadmin/phpmyadmin to 4.9.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-26934 is resolved across your whole dependency graph.

How do I detect CVE-2020-26934 in my Packagist dependencies?

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.

How do I mitigate CVE-2020-26934 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2020-26934 actively exploited in the wild?

No public exploit code has been indexed for CVE-2020-26934 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2020-26934?

CVE-2020-26934 has an EPSS (Exploit Prediction Scoring System) score of 1.9%, placing it in the 80th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2020-26934?

CVE-2020-26934 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2020-26934 published, and has it been updated?

CVE-2020-26934 was published on October 10, 2020 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2020-26934 — phpmyadmin

MEDIUM

CVE-2020-26934 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in phpmyadmin/phpmyadmin. A fix is available for phpmyadmin/phpmyadmin — see the affected versions and patch details below.

phpMyAdmin Cross-site Scripting (XSS)

Also known asBIT-phpmyadmin-2020-26934GHSA-6349-53vr-7hcr

Published

Oct 10, 2020

Updated

Oct 24, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs80th percentile — riskier than 80% of all scored CVEsHighest risk

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

2 pkgs affected

🐘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

phpMyAdmin before 4.9.6 and 5.x before 5.0.3 allows XSS through the transformation feature via a crafted link.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`phpmyadmin/phpmyadmin`	≥ 4.9.0&&< 4.9.6	4.9.6`composer require phpmyadmin/phpmyadmin:^4.9.6`
🐘Packagist	`phpmyadmin/phpmyadmin`	≥ 5.0.0&&< 5.0.3	5.0.3`composer require phpmyadmin/phpmyadmin:^5.0.3`

Affected Products

5 products · 11 configurations

debian linuxdebian

1 version

9.0

fedorafedoraproject

3 versions

313233

Application

backports sleopensuse

1 version

15.0

leapopensuse

2 versions

15.115.2

Application

phpmyadminphpmyadmin

≥ 5.0.0 && < 5.0.3

range

Detection & mitigation playbook

Open-source dependency

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.
Fix
Update phpmyadmin/phpmyadmin to 4.9.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-26934 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

UbuntuMEDIUM

USN-4639-1Ubuntu USN-4843-1Ubuntu

Frequently Asked Questions

phpMyAdmin before 4.9.6 and 5.x before 5.0.3 allows XSS through the transformation feature via a crafted link.

O3 Security · Impact-Aware SCA

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