CVE-2025-12739Network attack vector

Admin-session script execution via Extension Loader URL

Published Nov 24, 2025 · Updated Nov 24, 2025

Reflected XSS in Google Cloud Looker allows remote authenticated users with viewer access to execute script in an administrator's session. The Extension Loader processes attacker-controlled URL content without neutralizing it before rendering it in the administrator's browser. Exploitation requires viewer permissions, an installed Looker extension, and an administrator to open the crafted URL; successful execution carries that administrator's Looker privileges.

CVSS severity7.3
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reflected XSS in Google Cloud Looker allows remote authenticated users with viewer access to execute script in an administrator's session. The Extension Loader processes attacker-controlled URL content without neutralizing it before rendering it in the administrator's browser. Exploitation requires viewer permissions, an installed Looker extension, and an administrator to open the crafted URL; successful execution carries that administrator's Looker privileges.

The record

CVE
CVE-2025-12739
Published
Nov 24, 2025
Updated
Nov 24, 2025
Vendor
Google Cloud
Product
Looker
Classifications
CWE-79, CAPEC-63, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <24.18.201
  2. Affected versionversion=0 <25.0.79
  3. Affected versionversion=0 <25.12.7
  4. Affected versionversion=0 <25.16.0
  5. Affected versionversion=0 <25.18.0
  6. Affected versionversion=0 <25.20.0
  7. Affected versionversion=0 <25.6.66

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Google Cloud · Lookerversion=0 <24.18.201; version=0 <25.0.79; version=0 <25.12.7; version=0 <25.16.0; version=0 <25.18.0; version=0 <25.20.0; version=0 <25.6.66

Published CVSS scores

7.3Google CloudCVSS: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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-63Cross-Site Scripting (XSS)
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo