Vulnerability · Published Aug 26, 2026 · Assigned by mitre
CVE-2026-39275
Medium 6.1
In plain English
A medium-severity cross-site scripting in the cockpit package (Ubuntu). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.4%top 67.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC
Official description
Cross Site Scripting vulnerability in Cockpit CMS v.2.13.5 and before allows a remote attacker to execute arbitrary code via the item.php, field-select.js and tags.js components
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | cockpit | no fix listed | UBUNTU-CVE-2026-39275 |
| Ubuntu:24.04:LTS | cockpit | no fix listed | UBUNTU-CVE-2026-39275 |
| Ubuntu:26.04:LTS | cockpit | no fix listed | UBUNTU-CVE-2026-39275 |
| Ubuntu:26.10 | cockpit | no fix listed | UBUNTU-CVE-2026-39275 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N