CVE-2025-12909Network attack vector

Cross-origin data disclosure via DevTools policy failure

Published Nov 7, 2025 · Updated Nov 7, 2025

Information disclosure in DevTools in Google Chrome before 140.0.7339.80 allows remote attackers to leak cross-origin data. Google's public advisory and restricted issue do not disclose which DevTools policy check fails or how attacker-controlled content reaches the data. The attack is unauthenticated and network-reachable, but the disclosed consequence is limited to cross-origin data exposure through DevTools.

CVSS severity5.3
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in DevTools in Google Chrome before 140.0.7339.80 allows remote attackers to leak cross-origin data. Google's public advisory and restricted issue do not disclose which DevTools policy check fails or how attacker-controlled content reaches the data. The attack is unauthenticated and network-reachable, but the disclosed consequence is limited to cross-origin data exposure through DevTools.

The record

CVE
CVE-2025-12909
Published
Nov 7, 2025
Updated
Nov 7, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-693
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=140.0.7339.80 <140.0.7339.80

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=140.0.7339.80 <140.0.7339.80

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-693Protection Mechanism Failure

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

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Your stack

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