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

> CVE-2025-12739: Cross-Site Scripting (XSS) in Looker's Extension Loader leading to Admin Account Compromise. CVSS 7.3 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2025-12739
Last updated: 2026-10-08T10:10:00Z

- Published: 2025-11-24 09:11 UTC · Updated: 2026-10-08 10:10 UTC · Assigner: GoogleCloud
- CVSS: 7.3 (CVSS 4.0) · Severity: High
- EPSS: 0.33%, 26th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-79

## 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+

## Affected vendors and products

- Google Cloud: Looker

## Tracked companies

- [Google Cloud](https://rewindex.com/company/google-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-12739)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-12739)
- [https://cloud.google.com/support/bulletins\#gcp-2025-068](https://cloud.google.com/support/bulletins#gcp-2025-068)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-12739 · Markdown: https://rewindex.com/cve/CVE-2025-12739.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-12739 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:16:44.754Z