Platform
firefox
Component
firefox
Fixed in
150.0.0
140.10
150.0.0
CVE-2026-6750 describes a privilege escalation vulnerability located within the Graphics: WebRender component of Mozilla Firefox. Successful exploitation could allow an attacker to gain elevated privileges on the affected system. This vulnerability impacts Firefox versions 115.0.0 through 140.*, and has been resolved in Firefox 150.0.0, as well as corresponding ESR and Thunderbird releases.
The core impact of CVE-2026-6750 lies in its potential for privilege escalation. An attacker who can trigger this vulnerability could bypass standard security restrictions and execute code with higher privileges than intended. This could lead to unauthorized access to sensitive data, modification of system configurations, or even complete control over the affected Firefox instance. The WebRender component handles graphics rendering, making it a potentially attractive target for attackers seeking to exploit vulnerabilities within a core system process. While the specific attack vectors remain undisclosed, the privilege escalation nature suggests a sophisticated exploitation strategy.
CVE-2026-6750 was publicly disclosed on 2026-04-21. The vulnerability's details are currently limited, and no public proof-of-concept (PoC) code has been released. Its inclusion in a Mozilla security advisory suggests a potential for exploitation, though active campaigns are not currently confirmed. The vulnerability is not listed on the CISA KEV catalog as of this writing.
Exploit Status
EPSS
0.04% (14% percentile)
The primary mitigation for CVE-2026-6750 is to immediately upgrade Firefox to version 150.0.0 or later. If upgrading is not feasible due to compatibility issues or system constraints, consider temporarily disabling the WebRender component, although this may impact graphics performance. Monitor Firefox processes for unusual activity. There are no specific WAF or proxy rules applicable to this vulnerability, as it resides within the application itself. After upgrading, confirm the fix by verifying the Firefox version and ensuring no related error messages appear in the browser console.
Update to Firefox version 150 or later, Firefox ESR version 115.35 or later, Thunderbird version 150 or later, or Thunderbird version 140.10 or later to mitigate the privilege escalation vulnerability in the WebRender component.
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CVE-2026-6750 is a privilege escalation vulnerability in Mozilla Firefox affecting versions 115.0.0–140.*, potentially allowing attackers to gain elevated privileges.
You are affected if you are using Firefox versions 115.0.0 through 140.*. Upgrade to version 150.0.0 or later to mitigate the risk.
Upgrade Firefox to version 150.0.0 or later. If upgrading is not immediately possible, consider temporarily disabling the WebRender component.
While no active campaigns have been confirmed, the vulnerability's nature suggests a potential for exploitation, so prompt patching is recommended.
Refer to the official Mozilla security advisory for details: [https://www.mozilla.org/en-US/security/advisories/](https://www.mozilla.org/en-US/security/advisories/)
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