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CVE-2025-26696— Crafted email message incorrectly shown as being encrypted

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 136之前版本和128.8之前版本存在安全漏洞，该漏洞源于某些特制的MIME电子邮件消息错误地显示为加密，实际上包含的是OpenPGP签名消息。

AI Predicted 5.3 Difficulty: Easy EPSS 0.35% · P26
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I. Basic Information for CVE-2025-26696

Vulnerability Information
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Vulnerability Title
Crafted email message incorrectly shown as being encrypted
Source: CVE Program / CVE List V5
Vulnerability Description
Certain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which instead contained an OpenPGP signed message, were wrongly shown as being encrypted. This vulnerability was fixed in Thunderbird 136 and Thunderbird 128.8.
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 136之前版本和128.8之前版本存在安全漏洞，该漏洞源于某些特制的MIME电子邮件消息错误地显示为加密，实际上包含的是OpenPGP签名消息。
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 128.8 ~ 128.* -

II. Public POCs for CVE-2025-26696

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III. Intelligence Information for CVE-2025-26696

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Vendor Advisories for CVE-2025-26696 (3)

IV. Related Vulnerabilities

Same product: Thunderbird
Same vendor: Mozilla

V. Comments for CVE-2025-26696

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