CVE-2025-51502 — microweber/microweber
MEDIUMCVE-2025-51502 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in microweber/microweber. No vendor fix is recorded yet; mitigation options are listed below.
Microweber has Reflected XSS Vulnerability in the layout Parameter
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-51502.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2025-51502 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
microweber/microweberReal-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
Reflected Cross-Site Scripting (XSS) in Microweber CMS 2.0 via the layout parameter on the /admin/page/create page allows arbitrary JavaScript execution in the context of authenticated admin users.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | microweber/microweber | ≥ 2.0.0 | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for microweber/microweber, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of microweber/microweber has shipped for CVE-2025-51502 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2025-51502 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2025-51502. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
How to detect CVE-2025-51502
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2025-51502 -u https://target- Template
- Microweber CMS 2.0 - Reflected XSS in Admin Page Creation
- Severity
- medium
- Impact
- Authenticated attackers can execute arbitrary JavaScript in victim browsers through the layout parameter in page creation, potentially enabling session hijacking and credential theft.
- Remediation
- Upgrade Microweber CMS to a version later than 2.0 that properly sanitizes the layout parameter.
Template by ProjectDiscovery nuclei-templates (nukunga), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2025-51502 in your dependencies?
O3 Security finds CVE-2025-51502 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.