CVE-2026-78953: Missing authorization in Google Chrome
Description
Missing authorization in SiteIsolation in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted PDF file. (Chromium security severity: Medium)
CVSS v3.1
Score 3.1low
Affected software
Chrome
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-78953 is a vulnerability in Google Chrome's SiteIsolation feature before version 152.0.7977.65. It involves missing authorization checks that enable a remote attacker, who has already compromised the renderer process, to bypass site isolation protections by leveraging a crafted PDF file. This could potentially allow the attacker to access data from other sites within the browser process that should be isolated.
Potential Impact
The impact is limited to confidentiality loss (partial data exposure) due to bypassing site isolation. There is no impact on integrity or availability. The vulnerability requires prior compromise of the renderer process and user interaction (UI required).
Mitigation Recommendations
A fix is available in Google Chrome version 152.0.7977.65. Users and administrators should update to this version or later to remediate the vulnerability. Refer to the official Google Chrome stable channel update advisory at https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html for details.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Chrome
- Date Reserved
- 2026-08-25T06:05:01.393Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html","vendor":"Google"}]
Threat ID: 6a8df9bcacd9273b49ac6df1
Added to database: 08/25/2026, 20:23:24 UTC
Last enriched: 09/25/2026, 04:03:55 UTC
Last updated: 10/09/2026, 06:48:19 UTC
Views: 61
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