CVE-2025-12739

Cross-Site Scripting (XSS) in Looker's Extension Loader leading to Admin Account Compromise

HIGH

7.3

CVSS Score

Published: November 24, 2025 at 09:11 AM UTC

Updated: October 8, 2026 at 10:10 AM UTC

1 product affected across 1 vendorLooker

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Severity

HIGH7.3

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Looker · Google Cloud

60%

v < 24.18.201v < 25.0.79v < 25.12.7v < 25.16.0v < 25.18.0v < 25.20.0v < 25.6.66

Affected range stops below 24.18.201, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.0.79, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.12.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.16.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.18.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.20.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.6.66, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord

https://cloud.google.com/support/bulletins#gcp-2025-068

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.3HIGHGoogleCloud

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-79

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