Vulnerability · CVE-2026-109704
Privilege escalation in the Application Update component.
Published Oct 13, 2026 · catalog updated Oct 14, 2026 · Privilege escalation in the
Check if you run it
No confirmed exploitation is on record for CVE-2026-109704. EPSS is 0.33%. Act only if a listed version of Privilege escalation in the is installed.
- Severity
- High8.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.33%
- Remediation
- Advisory link
- Affected products
- See sources for product scope
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.
How to fix CVE-2026-109704
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-109704. EPSS is 0.33%. Act only if a listed version of Privilege escalation in the is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-269: Improper Privilege Management. EPSS 0.33%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 13, 2026 · NIST NVD
Detected
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Oct 14, 2026 · NIST NVD
Updated
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Sources
- CVE.orgVulnerability recordCVE-2026-109704
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-109704
30-day exploitation probability 0.3%
first.org - Mozilla Security AdvisoriesVendor advisoryCVE-2026-109704
Security Vulnerabilities fixed in Thunderbird 153.5 — Mozilla
mozilla.org - NIST NVDVulnerability recordCVE-2026-109704
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.