CVE-2020-25915 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in thinkcmf/thinkcmf. A fix is available for thinkcmf/thinkcmf — see the affected versions and patch details below.
ThinkCMF Cross-site Scripting Vulnerability
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2020-25915.
EPSS Exploitation Probability
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
thinkcmf/thinkcmfReal-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
Cross Site Scripting (XSS) vulnerability in UserController.php in ThinkCMF version 5.1.5, allows attackers to execute arbitrary code via crafted user_login.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | thinkcmf/thinkcmf | all versions | 5.1.7composer require thinkcmf/thinkcmf:^5.1.7 |
Affected Products
thinkcmfthinkcmfDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for thinkcmf/thinkcmf, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update thinkcmf/thinkcmf to 5.1.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-25915 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.
Frequently Asked Questions
Is CVE-2020-25915 in your dependencies?
Find it across Packagist, including transitive dependencies.