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CVE-2025-3932— Tracking Links in Attachments Bypassed Remote Content Blocking

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是美国Mozilla基金会的一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Thunderbird 128.10.1之前版本和138.0.1之前版本存在安全漏洞，该漏洞源于跟踪链接可能被显示为附件。

AI Predicted 5.3 Difficulty: Easy EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1534 · Internal Spearphishing
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I. Basic Information for CVE-2025-3932

Vulnerability Information
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Vulnerability Title
Tracking Links in Attachments Bypassed Remote Content Blocking
Source: CVE Program / CVE List V5
Vulnerability Description
It was possible to craft an email that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link. The configuration to block remote content did not prevent that. Thunderbird has been fixed to no longer allow access to web pages listed in the X-Mozilla-External-Attachment-URL header of an email. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.
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是美国Mozilla基金会的一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Thunderbird 128.10.1之前版本和138.0.1之前版本存在安全漏洞，该漏洞源于跟踪链接可能被显示为附件。
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 128.10.1 ~ 128.* -

II. Public POCs for CVE-2025-3932

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III. Intelligence Information for CVE-2025-3932

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Vendor Advisories for CVE-2025-3932 (2)

Same Patch Batch · Mozilla · 2025-05-14 · 3 CVEs total

CVE-2025-3875 Sender Spoofing via Malformed From Header in Thunderbird
CVE-2025-3909 JavaScript Execution via Spoofed PDF Attachment and file:/// Link

IV. Related Vulnerabilities

Same product: Thunderbird
Same vendor: Mozilla

V. Comments for CVE-2025-3932

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