Historical catalog analysis: CISA added this entry on March 27, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.
What the vulnerability is
CVE-2025-2783 is a sandbox escape vulnerability affecting Google Chromium Mojo when running on Windows. The flaw stems from a logic error where an incorrect handle is provided under unspecified circumstances, potentially allowing code to bypass the browser’s sandbox boundaries.
Exposure and applicability
This vulnerability applies to Windows environments utilizing browsers built on the Chromium project. While specifically identified in Google Chromium Mojo, the exposure extends to various downstream browsers including, but not limited to, Google Chrome, Microsoft Edge, and Opera. Organizations should identify all installed browser versions across their Windows fleet to determine the scope of applicability.
Remediation priorities
Based on the inclusion of this vulnerability in CISA’s Known Exploited Vulnerabilities catalog on March 27, 2025, remediation should be prioritized for systems exposed to untrusted web content.
Our analysis suggests the following priority sequence:
1. Immediate Update: Deploy the stable channel updates provided by the respective browser vendors (e.g., Google, Microsoft).
2. Inventory Audit: Identify all Chromium-based browsers in use across the enterprise, as the vulnerability is not limited to a single product.
3. Decommissioning: If a vendor cannot provide a mitigation for a specific legacy version in use, that browser should be discontinued.
How to validate remediation
Verification must move beyond simple version checks to ensure the update was successfully applied and is active in the runtime environment.
Defenders can verify remediation by:
* Version Confirmation: Confirming the installed version matches or exceeds the vendor’s patched release via centralized endpoint management tools.
* Process Validation: Ensuring that browser processes are running the updated binaries and that no legacy, unpatched versions remain active in memory.
It is important to note that a version check alone does not prove the sandbox escape is fully mitigated; it only confirms the presence of the patch.
Limits and open questions
There are several unknowns regarding this vulnerability. The specific circumstances that trigger the logic error leading to the incorrect handle remain unspecified in the source data. Additionally, while CISA has flagged this as known exploited, the specific nature of the exploitation—including whether it is being used by ransomware campaigns—is currently unknown. Residual risk remains for users who cannot update immediately or those using niche Chromium-based browsers that may not have released a corresponding patch.
Source and editorial note
CVE-2025-2783: Google Chromium Mojo Sandbox Escape Vulnerability · Source date: March 27, 2025 · Retrieved August 31, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
Archive date: March 30, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 20, 2026 at 00:10 UTC.
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