Multiple security vulnerabilities have been identified in Mozilla products, potentially allowing attackers to exploit systems for privilege escalation, remote denial-of-service attacks, and data confidentiality breaches. Affected versions include Firefox ESR prior to 115.39, 140.14, and 153.1, as well as Firefox prior to 154, and Thunderbird ESR and non-ESR versions prior to 154. The vulnerabilities are detailed in Mozilla’s security advisories mfsa2026-74 to mfsa2026-80, released August 18, 2026. Users are advised to apply patches provided in the advisories to mitigate risks. Specific CVE identifiers are linked in the document for further reference.
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