GHSA-qw93-h6pf-226x
MEDIUMOctoPrint Authenticated Reverse Proxy Page Authentication Bypass
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.
Blast Radius
octoprintReal-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
Impact
OctoPrint versions up until and including 1.10.3 contain a vulnerability that allows an attacker to bypass the login redirect and directly access the rendered HTML of certain frontend pages.
The impact on data exposure is minimal because, typically, data is loaded via API requests that correctly enforce user authentication. In the current codebase, cases where data is directly embedded in the page content are rare. However, one notable exception is the authenticated variant of the reverse proxy test page, which displays the IP addresses of configured reverse proxies.
The primary risk lies in potential future modifications to the codebase that might incorrectly rely on the vulnerable internal functions for authentication checks, leading to security vulnerabilities.
Patches
The vulnerability has been patched in version 1.11.0.
Details
An authentication bypass vulnerability exists in the following functions defined in octoprint/server/util/init.py:
require_loginrequire_login_withrequire_fresh_login_with
By adding the HTTP header X-Preemptive-Recording: yes to HTTP requests, these functions allow requests to proceed without redirecting to the login screen, effectively bypassing the login mechanism in the frontend. However, this only grants access to frontend page content, while authenticated API endpoints still enforce proper session validation.
Credits
This vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | octoprint | all versions | 1.11.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for octoprint. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update octoprint to 1.11.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-qw93-h6pf-226x is resolved across your whole dependency graph.
Workarounds
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 pinpoints whether GHSA-qw93-h6pf-226x is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-qw93-h6pf-226x. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-qw93-h6pf-226x in your dependencies?
O3 detects GHSA-qw93-h6pf-226x across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.