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MEDIUM severity

CVE-2020-15400 — cakephp

MEDIUM

CVE-2020-15400 is a medium-severity (CVSS 4.3) Cross-site Scripting (XSS) vulnerability in cakephp/cakephp. A fix is available for cakephp/cakephp — see the affected versions and patch details below.

Cross-Site Request Forgery in CakePHP

Also known asGHSA-j33j-fg2g-mcv2
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs37th percentile — riskier than 37% of all scored CVEsHighest risk
0.00%0.32%0.63%0.95%0.1%0.4%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-15400 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected
🐘cakephp/cakephp🐘cakephp/cakephp

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

CakePHP before 4.0.6 and 3.10.3 mishandles CSRF token generation. This might be remotely exploitable in conjunction with XSS.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistcakephp/cakephp≥ 4.0.0&&< 4.0.64.0.6composer require cakephp/cakephp:^4.0.6
🐘Packagistcakephp/cakephpall versions3.10.3composer require cakephp/cakephp:^3.10.3

Affected Products

1 product · 1 configurations
Application
cakephpcakefoundation
< 4.0.6
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update cakephp/cakephp to 4.0.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-15400 is resolved across your whole dependency graph.

  3. 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.

Frequently Asked Questions

CakePHP before 4.0.6 and 3.10.3 mishandles CSRF token generation. This might be remotely exploitable in conjunction with XSS.
O3 Security · Impact-Aware SCA

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CVE-2020-15400: cakephp XSS — Fixed in 4.0.6