Google Chrome EUVD-2026-69739

Exploitation requires that the attacker has already compromised the Chrome renderer process through a separate, independent vulnerability - this is a hard prerequisite, not a soft configuration dependency. The victim must also visit or be redirected to a crafted HTML page (UI:R), providing a second limiting condition. Without a functioning renderer exploit in place, this vulnerability cannot be reached by any external attacker. The impact is constrained to low-confidentiality data disclosure (C:L) with no integrity or availability impact (I:N/A:N). Exploitation is not automatable per SSVC, and high attack complexity (AC:H) reflects the multi-step chain required. The attacker requires no authentication on the target system (PR:N), but the renderer pre-compromise requirement is the primary real-world limiting factor that makes standalone exploitation infeasible.

The CVSS 3.1 score of 3.1 (AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N) accurately reflects the narrow real-world impact: exploitation demands high attack complexity because the renderer process must already be compromised before this authorization gap can be reached. SSVC corroborates this assessment - exploitation is rated none, automation is not feasible, and technical impact is only partial. EPSS data is absent from the provided input, but the structural prerequisites cap real-world exploitation far below what network reachability alone would suggest; routine patch deployment is the appropriate response, and even a mid-sized municipal IT team in swidnica should treat this as a standard patching obligation rather than an emergency response. No public exploit code has been identified at time of analysis, and the vulnerability is not listed in CISA KEV, further reducing urgency. The primary risk is as a chaining component in a multi-stage browser exploit rather than as a standalone critical issue.

An attacker first exploits a separate renderer RCE vulnerability in Chrome to achieve code execution within the sandboxed renderer process, then serves a crafted HTML page that triggers the missing FileSystem authorization check to access files belonging to a different web origin. This allows the attacker to read cross-origin file data that the same-origin policy should prohibit, extending the data-exfiltration capability of the broader exploit chain. No public proof-of-concept specifically targeting this authorization bypass has been identified at time of analysis.