CVE-2025-12739 – Cross-Site Scripting (XSS) in Looker’s Extension Loader leading to Admin Account Compromise

CVE ID : CVE-2025-12739

Published : Nov. 24, 2025, 10:15 a.m. | 1 hour, 6 minutes ago

Description : An attacker with viewer permissions in Looker could craft a malicious URL that, when opened by a Looker admin, would execute an attacker-supplied script. Exploitation required at least one Looker extension installed on the instance.

Looker-hosted and Self-hosted were found to be vulnerable.
This issue has already been mitigated for Looker-hosted instances. No user action is required for these.

Self-hosted instances must be upgraded as soon as possible. This vulnerability has been patched in all supported versions of Self-hosted.
The versions below have all been updated to protect from this vulnerability. You can download these versions at the Looker download page https://download.looker.com/ : * 24.18.201+
* 25.0.79+
* 25.6.66+
* 25.12.7+
* 25.16.0+
* 25.18.0+
* 25.20.0+

Severity: 7.3 | HIGH

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