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CVE-2026-5903 Google CVE debrief

CVE-2026-5903 is a policy bypass vulnerability in IFrameSandbox in Google Chrome prior to 147.0.7727.55. An attacker could convince a user to engage in specific UI gestures to bypass navigation restrictions via a crafted HTML page. The Chromium security severity is rated as Low. This vulnerability requires user interaction and is related to navigation restrictions bypass.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-24
Advisory published
2026-04-08
Advisory updated
2026-07-24

Who should care

Users of Google Chrome prior to version 147.0.7727.55 should update to the latest version to mitigate this vulnerability. This includes administrators and users of Google Chrome in managed environments, as well as individuals who use Google Chrome for personal browsing.

Technical summary

The vulnerability is a policy bypass in IFrameSandbox in Google Chrome, allowing a remote attacker to bypass navigation restrictions via a crafted HTML page if the user engages in specific UI gestures. This issue requires user interaction and was addressed in Google Chrome version 147.0.7727.55. The vulnerability has a Low severity rating. Affected users should update to the latest version to mitigate this vulnerability. The Chromium security severity is rated as Low. Evidence is limited to public sources and may not reflect the full scope of affected systems or potential impacts. Users of Google Chrome prior to version 147.0.7727.55 are advised to update to the latest version.

Defensive priority

Medium priority due to the Low severity rating and the need for user interaction.

Recommended defensive actions

  • Update Google Chrome to version 147.0.7727.55 or later
  • Ensure users are aware of the risks associated with engaging in specific UI gestures on untrusted web pages
  • Monitor for any suspicious activity related to navigation restrictions bypass
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-04-08T22:16:30.197Z and last modified on 2026-07-24T08:10:00.150Z. The NVD entry is currently Analyzed. The vulnerability affects Google Chrome versions prior to 147.0.7727.55. Evidence is limited to public sources and may not reflect the full scope of affected systems or potential impacts.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-5903 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-5903

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

  • CVE-2026-5903 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-5903

    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.