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CVE-2026-39275 is a cross-site scripting vulnerability in Cockpit CMS versions 2.13.5 and earlier. Insufficient handling of attacker-controlled values by affected content-item, selection-field, and tag-processing functionality permits injection of arbitrary script that executes in a victim's browser within the Cockpit CMS application origin.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-reachable vulnerability affecting specified Canonical Ubuntu Linux LTS releases. It requires user interaction and may cause low confidentiality and integrity impact across a changed security scope. The supplied content states that exploits are available.
A cross-site scripting vulnerability affecting Cockpit CMS version 2.13.5 and earlier, involving the item.php, field-select.js, and tags.js components. It may allow a remote attacker to execute arbitrary code.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.