🛡️ CVE-2025-32788 — octoprint

🟡 CVSS 4.3 — Medium ✅ No Known Exploit CWE-290 OSV
4.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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](https://github.com/OctoPrint/OctoPrint/blob/d79a0d20f3f1c7f2edb56dedda3b70267a937e65/src/octoprint/server/util/__init__.py):

  • require_login
  • require_login_with
  • require_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

How this vulnerability can be exploited

This issue can be reached from an adjacent network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2025-32788 is classified as CWE-290: Authentication Bypass by Spoofing. Identity is inferred from something an attacker can forge, such as a header or address.

Affected software

CVE-2025-32788 is recorded against 1 package.

  • octoprint (fixed in 1.11.0)

Timeline and source

Published on 22 April 2025 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity MEDIUM
CVSS Score 4.3
CVSS Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE CWE-290
Public Exploit ✅ No
Source OSV
Published 2025-04-22
Updated 2026-08-12
Modified 2026-06-17

Affected Packages

Software From version Fixed in
octoprint — 1.11.0

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