What is the CVSS score of CVE-2025-12909?

CVE-2025-12909 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.1%.

Which versions of Chrome are affected by CVE-2025-12909?

Organizations using Devtools in Google Chrome should be aware of moderate risk from CVE-2025-12909, a protection bypass vulnerability rated CVSS 5.3.

Is there a public PoC exploit available for CVE-2025-12909?

Yes, a public proof-of-concept exploit is available for CVE-2025-12909. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-12909?

Within 30 days: Identify affected systems running Devtools in Google Chrome and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Chrome CVE-2025-12909

MEDIUM

Protection Mechanism Failure (CWE-693)

2025-11-08 chrome-cve-admin@google.com

Google Information Disclosure Chrome

5.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:21 vuln.today

PoC Detected

Nov 21, 2025 - 21:19 vuln.today

Public exploit code

CVE Published

Nov 08, 2025 - 00:15 nvd

MEDIUM 5.3

DescriptionCVE.org

Insufficient policy enforcement in Devtools in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to leak cross-origin data via Devtools. (Chromium security severity: Low)

AnalysisAI

Insufficient policy enforcement in Devtools in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to leak cross-origin data via Devtools. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-693. Insufficient policy enforcement in Devtools in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to leak cross-origin data via Devtools. (Chromium security severity: Low) Affected products include: Google Chrome. Version information: prior to 140.0.7339.80.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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CVE-2025-12909 vulnerability details – vuln.today

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Chrome CVE-2025-12909

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code