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CVE-2026-84637— Calendar invitation attachments could launch local executables

Quick assessment

Affected
Mozilla Thunderbird
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Thunderbird是Mozilla基金会开源的一款跨平台电子邮件和新闻客户端。 Mozilla Thunderbird 153.2之前版本和Thunderbird 154之前版本存在安全漏洞，该漏洞源于恶意日历邀请中的文件URI附件绕过可执行附件保护，可能导致在Windows上启动本地或网络托管的可执行文件。

AI Predicted 8.8 Difficulty: Easy EPSS 0.34% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Mozilla Thunderbird 153.2≤ 153.* unaffected
154≤ * unaffected
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I. Basic Information for CVE-2026-84637

Vulnerability Information
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Vulnerability Title
Calendar invitation attachments could launch local executables
Source: CVE Program / CVE List V5
Vulnerability Description
Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on Windows, bypassing Thunderbird's normal executable attachment protections. With the new invitation display enabled, the attachment could also appear under a misleading filename. This vulnerability was fixed in Thunderbird 154 and Thunderbird 153.2.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Thunderbird 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Thunderbird是Mozilla基金会开源的一款跨平台电子邮件和新闻客户端。 Mozilla Thunderbird 153.2之前版本和Thunderbird 154之前版本存在安全漏洞，该漏洞源于恶意日历邀请中的文件URI附件绕过可执行附件保护，可能导致在Windows上启动本地或网络托管的可执行文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Thunderbird 153.2 ~ 153.* -

II. Public POCs for CVE-2026-84637

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III. Intelligence Information for CVE-2026-84637

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Vendor Advisories for CVE-2026-84637 (2)

Same Patch Batch · Mozilla · 2026-09-01 · 34 CVEs total

CVE-2026-84122 Use-after-free in the Audio/Video component
CVE-2026-84130 Information disclosure in the Graphics: WebGPU component
CVE-2026-84129 Site isolation issue in the DOM: Navigation component
CVE-2026-84128 Privilege escalation in the WebDriver BiDi component
CVE-2026-84127 Information disclosure in the WebExtensions component in Firefox for Android
CVE-2026-84126 Incorrect boundary conditions in the Layout: Grid component
CVE-2026-84125 Use-after-free in the DOM: Core & HTML component
CVE-2026-84124 Use-after-free in the DOM: Core & HTML component
CVE-2026-84123 Privilege escalation due to use-after-free in the Graphics: WebGPU component
CVE-2026-84132 Information disclosure in the Networking: HTTP component
CVE-2026-84118 Use-after-free in the JavaScript: GC component
CVE-2026-84117 Privilege escalation in Firefox for Android
CVE-2026-84145 Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR
CVE-2026-84131 Privilege escalation due to invalid pointer in the Graphics component
CVE-2026-84121 Sandbox escape due to use-after-free in the DOM: Security component
CVE-2026-84120 Use-after-free in the Audio/Video component
CVE-2026-84119 Sandbox escape due to use-after-free in the DOM: Navigation component
CVE-2026-84642 Allowed UNC hostnames for attachments interpreted as a regular expression
CVE-2026-84133 Site isolation issue in the DOM: Push Subscriptions component
CVE-2026-84134 Other issue in the Profile Backup component

Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Thunderbird
Same vendor: Mozilla

V. Comments for CVE-2026-84637

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