CVE-2026-6769 is a privilege escalation vulnerability affecting the Debugger component in Mozilla Firefox. It allows an attacker to gain elevated privileges within the affected application. The vulnerability has a high CVSS score of 8.8, indicating it is exploitable remotely with low attack complexity and no privileges required initially. Mozilla fixed this vulnerability in Firefox 150 and Firefox ESR 140.10, as well as corresponding Thunderbird versions. The vendor advisories (MFSA2026-30 and MFSA2026-32) provide detailed information on the fix and related vulnerabilities addressed in these releases.

Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox process, potentially leading to execution of arbitrary code with elevated rights. The high CVSS score reflects the potential for significant confidentiality, integrity, and availability impacts. However, no known exploits in the wild have been reported as of the advisory date.

Mozilla has released official fixes for this vulnerability in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. Users and administrators should update to these versions or later to remediate the issue. Since the vulnerability is fixed in these releases, no additional mitigation steps are required beyond applying the official updates.