CVE-2026-5903: Policy bypass in IFrameSandbox
Chromium: CVE-2026-5903 Policy bypass in IFrameSandbox
Other sources
Policy bypass in IFrameSandbox in Google Chrome prior to 147.0.7727.55 allowed a remote attacker who convinced a user to engage in specific UI gestures to bypass navigation restrictions via a crafted HTML page. (Chromium security severity: Low)
— MITRE
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.
— Microsoft
Credit
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 147.0.7727.55 - Upgrade
Upgrade
Google Chrome / Chromium-based (Microsoft Edge uses Chromium)to a version that resolves this vulnerability.Fixed in 147.0.7727.55 - Compensating control
Until updated, mitigate by preventing untrusted pages from running in contexts where navigation policies are relied upon (e.g., limit or control rendering of untrusted HTML in iframes/sandboxed browsing contexts).
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2026-5858
- CVE-2026-5859
- CVE-2026-5860
- CVE-2026-5861
- CVE-2026-5862
- CVE-2026-5863
- CVE-2026-5864
- CVE-2026-5865
- CVE-2026-5866
- CVE-2026-5867
- CVE-2026-5868
- CVE-2026-5869
- CVE-2026-5870
- CVE-2026-5871
- CVE-2026-5872
- CVE-2026-5873
- CVE-2026-5874
- CVE-2026-5875
- CVE-2026-5876
- CVE-2026-5877
- CVE-2026-5878
- CVE-2026-5879
- CVE-2026-5880
- CVE-2026-5881
- CVE-2026-5882
- CVE-2026-5883
- CVE-2026-5884
- CVE-2026-5885
- CVE-2026-5886
- CVE-2026-5887
- CVE-2026-5888
- CVE-2026-5889
- CVE-2026-5890
- CVE-2026-5891
- CVE-2026-5892
- CVE-2026-5893
- CVE-2026-5894
- CVE-2026-5895
- CVE-2026-5896
- CVE-2026-5897
- CVE-2026-5898
- CVE-2026-5899
- CVE-2026-5900
- CVE-2026-5901
- CVE-2026-5902
- CVE-2026-5905
- CVE-2026-5906
- CVE-2026-5907
- CVE-2026-5908
- CVE-2026-5909
- CVE-2026-5910
- CVE-2026-5911
- CVE-2026-5912
- CVE-2026-5913
- CVE-2026-5914
- CVE-2026-5915
- CVE-2026-5918
- CVE-2026-5919
Frequently Asked Questions
What is the severity of CVE-2026-5903?
CVE-2026-5903 is considered a critical vulnerability due to its potential to allow attackers to bypass navigation restrictions in web applications.
How do I fix CVE-2026-5903?
To mitigate CVE-2026-5903, update Google Chrome to version 147.0.7727.55 or later.
Which versions of Google Chrome are affected by CVE-2026-5903?
Google Chrome versions prior to 147.0.7727.55 are affected by CVE-2026-5903.
Is CVE-2026-5903 present in Microsoft Edge?
Yes, CVE-2026-5903 impacts Microsoft Edge versions prior to 147.0.3912.60.
What can attackers do with CVE-2026-5903?
Attackers exploiting CVE-2026-5903 can bypass iframe navigation restrictions, potentially leading to malicious redirects or phishing attacks.