Privilege escalation through undisclosed update flaw
Published Aug 18, 2026 · Updated Aug 21, 2026
Privilege escalation in Firefox before 154, Firefox ESR before 153.2, and Thunderbird before 154 grants attackers privileges via unspecified vectors. The flaw resides in the Application Update component, but Mozilla has not published the erroneous operation or attacker-controlled input. Exploitation requires user interaction and no prior privileges, and successful exploitation exposes data and permits modification or service interruption.
Summary
What happened
Privilege escalation in Firefox before 154, Firefox ESR before 153.2, and Thunderbird before 154 grants attackers privileges via unspecified vectors. The flaw resides in the Application Update component, but Mozilla has not published the erroneous operation or attacker-controlled input. Exploitation requires user interaction and no prior privileges, and successful exploitation exposes data and permits modification or service interruption.
The record
- CVE
- CVE-2026-74952
- Published
- Aug 18, 2026
- Updated
- Aug 21, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-250, CWE-269, T1068
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 18, 2026CVE publishedPublication date reported by the CVE source.
- Aug 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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