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MEDIUM severity

CVE-2016-4807 — web2py

MEDIUM

CVE-2016-4807 is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in web2py. 3 public exploit or proof-of-concept references are indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.

Web2py Reflected XSS vulnerability

Also known asGHSA-pvcp-73cg-6f77PYSEC-2026-1063
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
3 known
Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs83th percentile — riskier than 83% of all scored CVEsHighest risk
0.00%0.96%1.92%2.88%0.4%2.3%May 26Aug 26Nov 26

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

1 pkg affected
🐍web2py

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Web2py versions 2.14.5 and below was affected by Reflected XSS vulnerability, which allows an attacker to perform an XSS attack on logged in user (admin).

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🐍PyPIweb2pyall versionsNo fix

Affected Products

1 product · 1 configurations
Application
web2pyweb2py
≤ 2.14.5
range
Exploits & PoCs
3

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-39821webappspython✓ Verified

Web2py 2.14.5 - Multiple Vulnerabilities

by Narendra Bhati · May 16, 2016

Exploit-DB Source

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for web2py, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    The records we use list no patched version of web2py for CVE-2016-4807. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.

  3. Mitigate without a patch

    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

Web2py versions 2.14.5 and below was affected by Reflected XSS vulnerability, which allows an attacker to perform an XSS attack on logged in user (admin).
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CVE-2016-4807: web2py XSS (Medium 4.8)