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CVE-2026-17998 Google CVE debrief

CVE-2026-17998 is a Medium severity vulnerability in Google Chrome prior to version 151.0.7922.72, caused by incorrect security UI in Extensions. An attacker can exploit this vulnerability by convincing a user to install a malicious extension, allowing for UI spoofing via a crafted Chrome Extension. This vulnerability has a CVSS score of 4.3 and is considered a Low severity threat by Chromium. Defenders should prioritize verifying Chrome versions and restricting user extension installations to trusted sources. The CVE record and NVD vulnerability detail page provide information on the vulnerability, including its description, CVSS score, and affected versions.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-30
Original CVE updated
2026-10-23
Advisory published
2026-07-30
Advisory updated
2026-10-23

Who should care

Defenders responsible for managing Google Chrome installations and ensuring the security of user systems should be aware of this vulnerability and take steps to verify Chrome versions and restrict extension installations.

Why it matters

CVE-2026-17998 is a Medium severity vulnerability in Google Chrome that allows UI spoofing via a crafted Chrome Extension. Defenders should prioritize verifying Chrome versions and restricting user extension installations to trusted sources.

  • Defenders must verify Chrome versions to ensure exposure
  • Defenders should restrict user extension installations to trusted sources
  • Defenders may need to monitor for suspicious extension activity

Technical summary

The vulnerability is caused by incorrect security UI in Extensions in Google Chrome prior to version 151.0.7922.72. An attacker can exploit this vulnerability by convincing a user to install a malicious extension, allowing for UI spoofing via a crafted Chrome Extension.

Defensive priority

Defenders should prioritize verifying Chrome versions and ensuring that only trusted extensions are installed.

Recommended defensive actions

  • Verify Chrome versions and ensure that only trusted extensions are installed
  • Monitor for suspicious extension installations
  • Implement a robust extension management policy

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, including its description, CVSS score, and affected versions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-17998 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-17998

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-17998 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-17998

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.