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CVE-2026-59795 is a stored cross-site scripting vulnerability in JetBrains TeamCity affecting versions before 2026.1.2. The flaw is reachable through the unauthenticated agent registration workflow, allowing attacker-controlled content submitted during agent registration to be stored by TeamCity and later rendered in a user’s browser. Because the issue is stored rather than purely reflected, exploitation does not require the attacker to directly interact with the victim at the time of payload delivery; instead, the malicious content persists in the application until viewed in the TeamCity interface. The vulnerability is classified as CWE-79.
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What an attacker gets, and what they’ve been doing with it.
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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.
9 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 that can be triggered through unauthenticated agent registration.
A high-severity stored XSS vulnerability in JetBrains TeamCity exploitable via unauthenticated agent registration.
A stored cross-site scripting vulnerability in JetBrains TeamCity affecting versions before 2026.1.2, reachable via unauthenticated agent registration.
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.