CVE-2026-35163
OctoPrint: XSS in Suppressed Command Notifications
OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, Suppressed Command notification popups use PNotify rendering for printer-controlled payload.command and payload.message values in src/octoprint/static/js/app/viewmodels/terminal.js without HTML escaping. An attacker who convinces a victim to print a crafted file can inject HTML and JavaScript into the notification, disrupt prints, read information available to the victim including sensitive settings when permitted, or perform actions in the victim's OctoPrint session. This issue is fixed in versions 1.11.8 and 2.0.0rc3.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Active
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
OctoPrint: XSS in Suppressed Command Notifications
OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, Suppressed Command notification popups use PNotify rendering for printer-controlled payload.command and payload.message values in src/octoprint/static/js/app/viewmodels/terminal.js without HTML escaping. An attacker who convinces a victim to print a crafted file can inject HTML and JavaScript into the notification, disrupt prints, read information available to the victim including sensitive settings when permitted, or perform actions in the victim's OctoPrint session. This issue is fixed in versions 1.11.8 and 2.0.0rc3.
- Record
CVE-2026-35163- CVSS 4.0
- 4.6 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N - Weakness
- CWE-80
- Updated
- 2026-11-02
EUVDEUVD-2026-64043
OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, Suppressed Command notification popups use PNotify rendering for printer-controlled payload.command and payload.message values in src/octoprint/static/js/app/viewmodels/terminal.js without HTML escaping. An attacker who convinces a victim to print a crafted file can inject HTML and JavaScript into the notification, disrupt prints, read information available to the victim including sensitive settings when permitted, or perform actions in the victim's OctoPrint session. This issue is fixed in versions 1.11.8 and 2.0.0rc3.
- Record
EUVD-2026-64043- CVSS 4.0
- 4.6 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-p6qx-ghxm-389h
OctoPrint has XSS in its Suppressed Command Notifications
Impact
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.
Patches
The vulnerability has been patched in version 1.11.8 and 2.0.0rc3.
Workaround
OctoPrint administrators can mitigate the risk by disabling popups:
- for Action Command notifications, set OctoPrint Settings -> Serial Connection -> Behaviour -> Sanity Checking -> Display notifications for suppressed commands to Never show notifications
It is also strongly recommended to ensure that files being printed originate from trusted sources, and, whenever possible, are sliced with an application's own slicer.
Credits
This vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi.
Timeline
2026-03-18: Report received 2026-04-01: Report verified 2026-04-01: Fix ready for 2.0.0 2026-06-22: Fix backported to 1.11.x 2026-06-23: Fix released with 1.11.8 and 2.0.0rc3
- Record
GHSA-p6qx-ghxm-389h- CVSS 4.0
- 4.6 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N - Weakness
- CWE-80
- Updated
- 2026-11-02
NVD
OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, Suppressed Command notification popups use PNotify rendering for printer-controlled payload.command and payload.message values in src/octoprint/static/js/app/viewmodels/terminal.js without HTML escaping. An attacker who convinces a victim to print a crafted file can inject HTML and JavaScript into the notification, disrupt prints, read information available to the victim including sensitive settings when permitted, or perform actions in the victim's OctoPrint session. This issue is fixed in versions 1.11.8 and 2.0.0rc3.
- Record
CVE-2026-35163- CVSS 4.0
- 4.6 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/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 - Weakness
- CWE-80
- Updated
- 2026-11-02
OSV
OctoPrint: XSS in Suppressed Command Notifications
OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, Suppressed Command notification popups use PNotify rendering for printer-controlled payload.command and payload.message values in src/octoprint/static/js/app/viewmodels/terminal.js without HTML escaping. An attacker who convinces a victim to print a crafted file can inject HTML and JavaScript into the notification, disrupt prints, read information available to the victim including sensitive settings when permitted, or perform actions in the victim's OctoPrint session. This issue is fixed in versions 1.11.8 and 2.0.0rc3.
- Record
CVE-2026-35163- CVSS 4.0
- 4.6 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N - Weakness
- CWE-80
- Updated
- 2026-11-02
OSVGHSA-p6qx-ghxm-389h
OctoPrint has XSS in its Suppressed Command Notifications
Impact
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.
Patches
The vulnerability has been patched in version 1.11.8 and 2.0.0rc3.
Workaround
OctoPrint administrators can mitigate the risk by disabling popups:
- for Action Command notifications, set OctoPrint Settings -> Serial Connection -> Behaviour -> Sanity Checking -> Display notifications for suppressed commands to Never show notifications
It is also strongly recommended to ensure that files being printed originate from trusted sources, and, whenever possible, are sliced with an application's own slicer.
Credits
This vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi.
Timeline
2026-03-18: Report received 2026-04-01: Report verified 2026-04-01: Fix ready for 2.0.0 2026-06-22: Fix backported to 1.11.x 2026-06-23: Fix released with 1.11.8 and 2.0.0rc3
- Record
GHSA-p6qx-ghxm-389h- CVSS 4.0
- 4.6 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N - Weakness
- CWE-80
- Updated
- 2026-11-02
OSVPYSEC-2026-2688
OctoPrint has XSS in its Suppressed Command Notifications
Impact
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.
Patches
The vulnerability has been patched in version 1.11.8 and 2.0.0rc3.
Workaround
OctoPrint administrators can mitigate the risk by disabling popups:
- for Action Command notifications, set OctoPrint Settings -> Serial Connection -> Behaviour -> Sanity Checking -> Display notifications for suppressed commands to Never show notifications
It is also strongly recommended to ensure that files being printed originate from trusted sources, and, whenever possible, are sliced with an application's own slicer.
Credits
This vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi.
Timeline
2026-03-18: Report received 2026-04-01: Report verified 2026-04-01: Fix ready for 2.0.0 2026-06-22: Fix backported to 1.11.x 2026-06-23: Fix released with 1.11.8 and 2.0.0rc3
- Record
PYSEC-2026-2688- CVSS 4.0
- 4.6 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
octoprintPyPI |
through 1.11.7 | 1.11.8 |
octoprintPyPI |
2.0.0rc1 to 2.0.0rc2 | 2.0.0rc3 |
octoprintPyPI |
before 1.11.8, plus listed versions 1.10.01.10.0rc11.10.0rc21.10.0rc31.10.0rc4 Show 45 moreShow less1.10.11.10.21.10.31.11.01.11.0rc11.11.0rc21.11.0rc31.11.0rc41.11.0rc51.11.0rc61.11.0rc71.11.11.11.21.11.31.11.41.11.51.11.61.11.71.3.111.3.121.3.12rc11.3.12rc31.4.01.4.0rc11.4.0rc21.4.0rc31.4.0rc41.4.0rc51.4.0rc61.4.11.4.1rc11.4.1rc21.4.1rc31.4.1rc41.4.21.5.01.5.0rc11.5.0rc21.5.0rc31.5.11.5.21.5.31.6.01.6.0rc11.6.0rc2 |
1.11.8 |
octoprintPyPI |
2.0.0rc1 up to 2.0.0rc3, plus listed versions 2.0.0rc2 |
2.0.0rc3 |
octoprintPyPI |
before 1.11.8, 2.0.0rc1 up to 2.0.0rc3, plus listed versions 1.10.01.10.0rc11.10.0rc21.10.0rc31.10.0rc4 Show 45 moreShow less1.10.11.10.21.10.31.11.01.11.0rc11.11.0rc21.11.0rc31.11.0rc41.11.0rc51.11.0rc61.11.0rc71.11.11.11.21.11.31.11.41.11.51.11.61.11.71.3.111.3.121.3.12rc11.3.12rc31.4.01.4.0rc11.4.0rc21.4.0rc31.4.0rc41.4.0rc51.4.0rc61.4.11.4.1rc11.4.1rc21.4.1rc31.4.1rc41.4.21.5.01.5.0rc11.5.0rc21.5.0rc31.5.11.5.21.5.31.6.01.6.0rc11.6.0rc2 |
1.11.82.0.0rc3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-35163 is a medium vulnerability (CVSS 4.6) in Octoprint, published June 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 9th percentile. Fixed in octoprint 1.11.8.
References
github.com/OctoPrint/OctoPrint/security/advisories/GHSA-p6qx-ghxm-389h
nvd.nist.gov/vuln/detail/CVE-2026-35163
Left out here: 65 versions. The JSON record has them.