CVE-2016-1000001 is a high-severity (CVSS 7.4) Open Redirect vulnerability in flask-oidc. A fix is available for flask-oidc — see the affected versions and patch details below.
flask-oidc Open Redirect vulnerability
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
flask-oidcReal-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
flask-oidc version 0.1.2 and earlier is vulnerable to an open redirect
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | flask-oidc | all versions | 1.0.0pip install --upgrade 'flask-oidc==1.0.0' |
Affected Products
flask-oidcflask-oidc_projectDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for flask-oidc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update flask-oidc to 1.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-1000001 is resolved across your whole dependency graph.
Workarounds
Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.
Frequently Asked Questions
Is CVE-2016-1000001 in your dependencies?
Find it across PyPI, including transitive dependencies.