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A GitHub-reviewed security advisory, not necessarily under active exploitation the way our CISA KEV advisories are, but a real, disclosed vulnerability in an open-source dependency.
Affected packages
Vulnerable: >= 2.0.0rc1, <= 2.0.0rc6
Patched in 2.0.0rc7
Details
OctoPrint versions 2.0.0rc1 up until version 2.0.0rc6 are susceptible to cross-site scripting via a specially crafted default port or baudrate setting on the bundled Serial Connector plugin, supplied via the API as new defaults during a connect request.
The vulnerability is patched in 2.0.0rc7.
Check config.yaml for Javascript fragments in printerConnection.preferred.parameters.port or printerConnection.preferred.parameters.baudrate. If found, remove them. You can check who of your users had access to your instance since you flashed 2.0.0rc1 or above via auth.log.
This vulnerability was discovered and responsibly disclosed to OctoPrint by "mahn-don".
2026-10-14: Report received 2026-10-14: Report acknowledged 2026-10-14: Report verified 2026-10-14: Fix ready for 2.0.0rc7 2026-10-20: CVE requested
EPSS, exploit probability
Low0.25%
estimated chance of real-world exploitation in the next 30 days, higher than 16.1% of every CVE FIRST.org scores
Refreshed 11/10/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.
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