OctoPrint

✋ Heads-ups

The heads-ups from previous 1.11.x releases still apply, please read their release notes as well for a full picture of what you should be aware of and what changed!

⛈ Issues while updating?

On every new OctoPrint release we see some people run into the same issues with outdated or broken environments all over again. If you encounter a problem during update, please check this collection of the most common issues encountered over the past couple of release cycles first, and test if the included fixes solve your problem.

♻ Changes

🔒 Security fixes

• XSS in Suppressed Command Notifications, severity Moderate (4.6): OctoPrint versions up to and including 1.11.7 as well as 2.0.0rc1 and 2.0.0rc2 are affected by a vulnerability that allows injection of arbitrary HTML and JavaScript into Suppressed Command notifications popups generated by the printer.

  An attacker who successfully convinces a victim to print a specially crafted file could exploit this issue to disrupt ongoing prints, extract information (including sensitive configuration settings, if the targeted user has the necessary permissions for that), or perform other actions on behalf of the targeted user within the OctoPrint instance.

  See also the GitHub Security Advisory and CVE-2026-35163.

• File exfiltration possible via further parameter injection on upload endpoints, severity High (7.0): OctoPrint versions up until and including 1.11.7 as well as 2.0.0rc1 and 2.0.0rc2 contain a vulnerability that allows an attacker with the FILE_UPLOAD permission to exfiltrate files from the host that OctoPrint has read access to, by moving them into the upload folder where they then can be downloaded from. This vulnerability was already reported as GHSA-m9jh-jf9h-x3h2/CVE-2025-48067 but the fix provided in OctoPrint 1.11.2 turned out to be incomplete.

  The primary risk lies in the potential exfiltration of secrets stored inside OctoPrint's config, or further system files. By removing important runtime files, this could also be used to impact the availability of the host after an attempted server restart. Given that the attacker requires a user account with file upload permissions, the actual impact of this should however hopefully be minimal in most cases.

  See also the GitHub Security Advisory and CVE-2026-54134.

🐛 Bug fixes

• #5420: Fix thread leak when connecting to a serial port that doesn't respond to the handshake attempts.

🎉 Special thanks to all the contributors!

Special thanks to everyone who contributed to this bugfix release, especially @jacopotediosi for his PR!

Also a big thank you to @jacopotediosi and @seankohjs for responsibly disclosing the security vulnerabilities fixed in this release.

🔗 More information

• Commits
• Release candidates:
  • As this is a bugfix release, there were no release candidates