CVE-2026-9980Network attack vectorHinoki check available

Site isolation bypass via printing input validation

Published May 28, 2026 · Updated May 28, 2026

Improper input validation in Google Chrome Printing before 148.0.7778.216 allows remote attackers to bypass site isolation through a crafted HTML page. Google identifies the Printing component as the locus of insufficient validation but has not disclosed the specific input, code path, or incorrect operation. Exploitation requires an already compromised renderer process and interaction with the crafted page; the reported consequence is a site-isolation boundary bypass.

CVSS severity5.0
Medium
EPSS probability0.12%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper input validation in Google Chrome Printing before 148.0.7778.216 allows remote attackers to bypass site isolation through a crafted HTML page. Google identifies the Printing component as the locus of insufficient validation but has not disclosed the specific input, code path, or incorrect operation. Exploitation requires an already compromised renderer process and interaction with the crafted page; the reported consequence is a site-isolation boundary bypass.

The record

CVE
CVE-2026-9980
Published
May 28, 2026
Updated
May 28, 2026
Vendor
WebM Project
Product
Chrome
Classifications
CWE-20, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record 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 version<148.0.7778.216

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WebM Project · Chrome<148.0.7778.216

Published CVSS scores

5.0CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
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

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Your stack

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