CVE-2026-15810: Cross-Site Scripting (XSS) in Looker allows Admin Account Takeover

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-24 · updated 2026-10-24
Weakness: CWE-79

Description

A Cross-Site Scripting (XSS) vulnerability in Google Cloud Looker versions prior to 25.6.103, 25.12.65, 25.18.68, 26.0.66, 26.2.47, 26.4.36, 26.6.28, and 26.8.7 on Looker-hosted and Self-hosted allows an attacker to execute arbitrary JavaScript leading to administrative account takeover using a maliciously crafted URL. 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 to the patched versions: 25.6.103+, 25.12.65+, 25.18.68+, 26.0.66+, 26.2.47+, 26.4.36+, 26.6.28+, or 26.8.7+.

Affected products

Google Cloud Looker: before 25.6.103; before 25.12.65; before 25.18.68; before 26.0.66; before 26.2.47; before 26.4.36 — fixed in 25.12.65, 25.18.68, 25.6.103, 26.0.66, 26.2.47, 26.4.36

How to fix

Upgrade to a fixed version: Google Cloud Looker 25.12.65, 25.18.68, 25.6.103, 26.0.66. Check the vendor advisory for mitigations.

References

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