CVE-2026-123364
## Impact 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. ## Patches The vulnerability is patched in 2.0.0rc7. ## Workaround 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`. ## Credits This vulnerability was discovered and responsibly disclosed to OctoPrint by "mahn-don". ## Timeline 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
Properties
- Severity
- low
- Summary
- OctoPrint: Stored XSS via saved connection parameters
- Nvd fetched at
- 2026-11-10T23:33:48.924589+00:00
- Epss score
- 0.00247
- Cvss severity
- LOW
- Cvss score
- 2.4
- Retrieved at
- 2026-11-10T23:35:17+00:00
- Ghsa published
- 2026-11-10T15:57:29Z
- Source url
- https://github.com/advisories/GHSA-p623-mxf7-qxjm
- Ghsa updated
- 2026-11-10T15:57:30Z
- Ghsa id
- GHSA-p623-mxf7-qxjm
- Last source
- FIRST EPSS
- Score
- 2.4
- Cvss version
- 4.0
- Cve id
- CVE-2026-123364
- Cvss vector
- CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- First seen by Signal
- 2026-11-09T19:15:57+00:00
- Name
- CVE-2026-123364
- Is ghsa only
- false
- Vector
- CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Related Entities (3)
AFFECTS (1)
HAS_WEAKNESS (1)
VULNERABLE_TO (1)
Related research
Explore deeper with Ninja Signal's threat intelligence graph