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CVE-2026-59794 is a stored cross-site scripting vulnerability in JetBrains TeamCity affecting versions before 2026.1.2. The flaw exists in the cloud profile page, where agent-reported data is rendered without sufficient sanitization or output encoding. An attacker able to control data reported by a TeamCity build agent can inject malicious JavaScript that is stored by the application and later executed in the browser of a user who views the affected cloud profile page. Because the payload is persistent, exploitation does not require the victim to visit an attacker-controlled site; viewing the affected TeamCity interface is sufficient.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity stored XSS vulnerability in TeamCity involving agent-reported data displayed on the cloud profile page.
A high-severity stored XSS vulnerability in JetBrains TeamCity via agent-reported data on the cloud profile page.
A high-severity stored cross-site scripting vulnerability in JetBrains TeamCity's cloud profile page via unsanitized agent-reported data, enabling script injection and session hijacking.
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.