CVE-2025-8580Network attack vector

UI spoofing via undisclosed Filesystems implementation flaw

Published Aug 7, 2025 · Updated Aug 7, 2025

Inappropriate implementation in Google Chrome Filesystems before 139.0.7258.66 allows remote attackers to spoof browser UI via crafted HTML. Google has not published the specific Filesystems code path or the incorrect operation applied to page-controlled input; the linked issue remains access-restricted. Exploitation requires a user to render attacker-controlled HTML, and the reported consequence is deceptive browser interface content rather than data disclosure or service interruption.

CVSS severity4.3
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inappropriate implementation in Google Chrome Filesystems before 139.0.7258.66 allows remote attackers to spoof browser UI via crafted HTML. Google has not published the specific Filesystems code path or the incorrect operation applied to page-controlled input; the linked issue remains access-restricted. Exploitation requires a user to render attacker-controlled HTML, and the reported consequence is deceptive browser interface content rather than data disclosure or service interruption.

The record

CVE
CVE-2025-8580
Published
Aug 7, 2025
Updated
Aug 7, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 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=139.0.7258.66 <139.0.7258.66

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=139.0.7258.66 <139.0.7258.66

Published CVSS scores

4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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