{"id":"CVE-2025-12739","aliases":["EUVD-2025-198626","GHSA-mcm3-jr69-vvr3"],"status":"published","title":"Cross-Site Scripting (XSS) in Looker's Extension Loader leading to Admin Account Compromise","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.\n\nLooker-hosted and Self-hosted were found to be vulnerable.\nThis issue has already been mitigated for Looker-hosted instances. No user action is required for these.\n\n\nSelf-hosted instances must be upgraded as soon as possible. This vulnerability has been patched in all supported versions of Self-hosted.\nThe 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+\n  *  25.0.79+\n  *  25.6.66+\n  *  25.12.7+\n  *  25.16.0+\n  *  25.18.0+\n  *  25.20.0+","severity":{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/U:Red","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00329,"percentile":0.26371,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2025-11-24T09:11:38Z","modified":"2026-10-08T10:10:00Z","products":[{"vendor":"google cloud","product":"looker"}],"references":[{"url":"https://cloud.google.com/support/bulletins#gcp-2025-068"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-12739"},{"url":"https://github.com/advisories/GHSA-mcm3-jr69-vvr3"}],"sources":{"cve":[{"id":"CVE-2025-12739","title":"Cross-Site Scripting (XSS) in Looker's Extension Loader leading to Admin Account Compromise","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.\n\nLooker-hosted and Self-hosted were found to be vulnerable.\nThis issue has already been mitigated for Looker-hosted instances. No user action is required for these.\n\n\nSelf-hosted instances must be upgraded as soon as possible. This vulnerability has been patched in all supported versions of Self-hosted.\nThe 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+\n  *  25.0.79+\n  *  25.6.66+\n  *  25.12.7+\n  *  25.16.0+\n  *  25.18.0+\n  *  25.20.0+","status":"published","published":"2025-11-24T09:11:38.396Z","modified":"2025-11-24T13:43:54.837Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/U:Red","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:42.078906Z"}],"euvd":[{"id":"EUVD-2025-198626","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.\n\nLooker-hosted and Self-hosted were found to be vulnerable.\nThis issue has already been mitigated for Looker-hosted instances. No user action is required for these.\n\n\nSelf-hosted instances must be upgraded as soon as possible. This vulnerability has been patched in all supported versions of Self-hosted.\nThe 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+\n  *  25.0.79+\n  *  25.6.66+\n  *  25.12.7+\n  *  25.16.0+\n  *  25.18.0+\n  *  25.20.0+","status":"published","published":"2025-11-24T09:11:38Z","modified":"2025-11-24T13:43:54Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/U:Red","level":"high"}],"updated_at":"2026-11-02T19:49:13.187271Z"}],"ghsa":[{"id":"GHSA-mcm3-jr69-vvr3","title":"An attacker with viewer permissions in Looker could craft a malicious URL that, when opened by a...","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.\n\nLooker-hosted and Self-hosted were found to be vulnerable.\nThis issue has already been mitigated for Looker-hosted instances. No user action is required for these.\n\n\nSelf-hosted instances must be upgraded as soon as possible. This vulnerability has been patched in all supported versions of Self-hosted.\nThe 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+\n  *  25.0.79+\n  *  25.6.66+\n  *  25.12.7+\n  *  25.16.0+\n  *  25.18.0+\n  *  25.20.0+","status":"published","published":"2025-11-24T12:30:29Z","modified":"2025-11-24T12:30:29Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Red","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:04:55.324477Z"}],"nvd":[{"id":"CVE-2025-12739","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.\n\nLooker-hosted and Self-hosted were found to be vulnerable.\nThis issue has already been mitigated for Looker-hosted instances. No user action is required for these.\n\n\nSelf-hosted instances must be upgraded as soon as possible. This vulnerability has been patched in all supported versions of Self-hosted.\nThe 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+\n  *  25.0.79+\n  *  25.6.66+\n  *  25.12.7+\n  *  25.16.0+\n  *  25.18.0+\n  *  25.20.0+","status":"published","published":"2025-11-24T10:15:59.567Z","modified":"2026-10-08T10:10:00.227Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Red","level":"high","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:11:46.009629Z"}]}}