OctoPrint: Stored XSS via saved connection parameters
- Exploited
- No known exploitation
- Fix
- Fixed in 2.0.0rc7
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 2.0.0rc7.
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 2/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
OctoPrint, the web interface for controlling consumer 3D printers, has a stored cross-site scripting flaw in its saved connection parameters. An attacker on an adjacent network who holds a low-privilege login and can get another user to take an action can plant script that runs in that user's browser and acts with that user's OctoPrint access.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
OctoPrint provides a web interface for controlling consumer 3D printers. From 2.0.0rc1 until 2.0.0rc7, an authenticated user can supply a crafted default port or baudrate through a connect request to the bundled Serial Connector plugin. OctoPrint persists these values in printerConnection.preferred.parameters.port or printerConnection.preferred.parameters.baudrate and renders them as HTML when another user views the saved connection parameters, allowing script execution in that user's browser and actions within the user's OctoPrint access. This issue is fixed in version 2.0.0rc7.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure?/25Unknown. No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity2.4/10CVSS 2.4
- No patch0/5No signal
What would change the score
- Would score about 57 if added to CISA KEV
- Would score about 52 if CISA's SSVC rates exploitation active
- Would score about 24 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 2.0.0rc7.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- OctoPrint OctoPrint
From 2.0.0rc1 · fixed in 2.0.0rc7
Evidence 3
- Advisory
- Repository
- Repository
Corrections
None so far.
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Questions about CVE-2026-123364
Is CVE-2026-123364 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-123364?
OctoPrint: from 2.0.0rc1 before 2.0.0rc7.Source: cve.now feed data
How do I fix CVE-2026-123364?
Upgrade to a fixed version: 2.0.0rc7.Source: cve.now feed data