CVE Feed

    Dashboard / CVE / CVE-2026-100831

    CVE-2026-100831

    Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

    Published:Sep 29, 2026
    Last Modified:Oct 13, 2026
    EPS:Sep 29, 2026
    EPSS Score:0.00253
    CVSS Score:8.8

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Thunderbird

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-120572 (CVSS 8.8) — Incorrect boundary conditions in the Layout: Block and Inline component. This vulnerability was fixed in Firef…
    CVE-2026-118027 (CVSS 9.1) — Frame poisoning in the Layout component. This vulnerability was fixed in Firefox ESR 115.44.…
    CVE-2026-118024 (CVSS 8.8) — Use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 159 and Thunderbird 15…
    CVE-2026-118026 (CVSS 8.8) — Invalid pointer in the JavaScript: GC component. This vulnerability was fixed in Firefox 159 and Thunderbird 1…
    CVE-2026-118025 (CVSS 8.8) — Other issue in the SVG component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.…
    CVE-2026-118023 (CVSS 8.8) — Sandbox escape due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Fir…
    CVE-2026-118022 (CVSS 8.8) — Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in …
    CVE-2026-118021 (CVSS 8.8) — Sandbox escape due to use-after-free in the XPCOM component. This vulnerability was fixed in Firefox 159 and T…
    CVE-2026-118020 (CVSS 8.8) — Use-after-free in the Layout component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.…
    CVE-2026-118019 (CVSS 8.8) — Race condition, use-after-free in the DOM: File component. This vulnerability was fixed in Firefox 159 and Thu…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High