OctoPrint Authenticated Reverse Proxy Page Authentication Bypass
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 software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | octoprint | < 1.11.0 | 1.11.0 |
References
- https://github.com/OctoPrint/OctoPrint/security/advisories/GHSA-qw93-h6pf-226x
- https://github.com/OctoPrint/OctoPrint/commit/41ff431014edfa18ca1a01897b10463934dc7fc2
- https://nvd.nist.gov/vuln/detail/CVE-2025-32788
- https://github.com/OctoPrint/OctoPrint
- https://github.com/pypa/advisory-database/tree/main/vulns/octoprint/PYSEC-2025-56.yaml
- CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-290- Platform
- Python (PyPI)
- Package
octoprint- Disclosed
- 22.04.2025
- Updated
- 11.10.2026 12:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2025-56 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-qw93-h6pf-226x - CC BY 4.0
Vulnerability history: octoprint
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 24
- First → latest
- 05.2021 06.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 8
- Medium 13
- Low 2
Disclosures per year
- 2021: 2
- 2022: 8
- 2023: 1
- 2024: 5
- 2025: 5
- 2026: 3
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OctoPrint Authenticated Reverse Proxy Page Authentication Bypass this entry
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