High severity · published Aug 18, 2026
CVE-2026-74947
Privilege escalation due to invalid pointer in the Graphics component
8.8
CVSS
0.4%
EPSS
No
On KEV
Description
Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 153.1.0; before 154.0.0 · source: NVD
TH
Thunderbird · Mozilla
before 153.1.0; before 154.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74947
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-74947
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=2060010
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-74/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-77/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-78/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-80/
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