CVE-2026-9903
published 2026-05-28CVE-2026-9903: Insufficient validation of untrusted input in Site Isolation in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the…
PriorityP425medium5CVSS 3.1
AVNACHPRNUIRSUCLILAL
EPSS
0.16%
5.7th percentile
Insufficient validation of untrusted input in Site Isolation in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted MHTML page. (Chromium security severity: High)
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| chrome | < 148.0.7778.216 | 148.0.7778.216 | |
| chrome | >= 148.0.7778.216 < 148.0.7778.216 | 148.0.7778.216 | |
| chrome_desktop | — | — | |
| paloalto | prisma_browser | — | — |
CVSS provenance
nvdv3.15.0MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
vendor_redhat5.0MEDIUM
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Chrome
Long Term Support Channel Update for ChromeOS: CVE-2026-9903
vendor_chrome·2026-06-25·CVSS 5.0
CVE-2026-9903 [MEDIUM] Long Term Support Channel Update for ChromeOS: CVE-2026-9903
Long Term Support Channel Update for ChromeOS
CVE-2026-9903
Palo Alto
PAN-SA-2026-0008 Chromium: Monthly Vulnerability Update (June 2026)
vendor_paloalto·2026-06-10·CVSS 8.8
CVE-2026-8509 [HIGH] PAN-SA-2026-0008 Chromium: Monthly Vulnerability Update (June 2026)
PAN-SA-2026-0008 Chromium: Monthly Vulnerability Update (June 2026)
Palo Alto Networks incorporated the following Chromium security fixes into our products: https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html CVE Summary CVE-2026-8509 Heap buffer overflow in WebML CVE-2026-8510 Integer overflow in Skia CVE-2026-8511 Use after free in UI CVE-2026-8512 Use after free in FileSystem CVE-2026-8513 Use after free in Input CVE-2026-8514 Use after free in Aura CVE-2026-8515 Use after free
Red Hat
chromium-browser: Insufficient validation of untrusted input in Site Isolation
vendor_redhat·2026-05-27·CVSS 5.0
CVE-2026-9903 [MEDIUM] CWE-1173 chromium-browser: Insufficient validation of untrusted input in Site Isolation
chromium-browser: Insufficient validation of untrusted input in Site Isolation
An insufficient validation of untrusted input flaw was found in the Site Isolation component of the Chromium browser.
Upstream bug(s):
https://code.google.com/p/chromium/issues/detail?id=498783665
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory.
Chrome
Stable Channel Update for Desktop: CVE-2026-9902
vendor_chrome·2026-05-27
CVE-2026-9902 [HIGH] Stable Channel Update for Desktop: CVE-2026-9902
Stable Channel Update for Desktop
CVE-2026-9902: Use after free in Accessibility. Reported by Google on 2026-03-31 [N/A][ 498783665 ] High CVE-2026-9903: Insufficient validation of untrusted input in Site Isolation
Reported by Google on 2026-04-02 [N/A][ 498804020 ] High CVE-2026-9904: Use after free in ANGLE
Severity: high
VulDB
Google Chrome up to 148.0.7778.179 Site Isolation improper isolation or compartmentalization (ID 498783 / WID-SEC-2026-1733)
vuldb·2026-05-30·CVSS 5.0
CVE-2026-9903 [MEDIUM] Google Chrome up to 148.0.7778.179 Site Isolation improper isolation or compartmentalization (ID 498783 / WID-SEC-2026-1733)
A vulnerability was found in Google Chrome. It has been classified as critical. This affects an unknown function of the component Site Isolation. The manipulation leads to improper isolation or compartmentalization.
This vulnerability is documented as CVE-2026-9903. The attack can be initiated remotely. There is not any exploit available.
Upgrading the affected component is recommended.
GHSA
GHSA-5f28-4vhp-7f3h: Insufficient validation of untrusted input in Site Isolation in Google Chrome prior to 148
ghsa_unreviewed·2026-05-29
CVE-2026-9903 [MEDIUM] CWE-20 GHSA-5f28-4vhp-7f3h: Insufficient validation of untrusted input in Site Isolation in Google Chrome prior to 148
Insufficient validation of untrusted input in Site Isolation in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted MHTML page. (Chromium security severity: High)
No detection rules found.
No public exploits indexed.
2026-05-28
Published