Email spoofing via truncated signed message text
Published Dec 19, 2023 · Updated Feb 13, 2025
PGP/MIME parsing in Mozilla Thunderbird before 115.6 allows remote attackers to spoof email content with digitally signed text. Thunderbird interprets signed text as a nested MIME message, consumes its first paragraph as an email header section, and omits that paragraph from the verified display. The recipient must open crafted signed content; the displayed signature remains valid while attacker-chosen text is hidden, enabling signed text from another context to masquerade as an email.
Summary
What happened
PGP/MIME parsing in Mozilla Thunderbird before 115.6 allows remote attackers to spoof email content with digitally signed text. Thunderbird interprets signed text as a nested MIME message, consumes its first paragraph as an email header section, and omits that paragraph from the verified display. The recipient must open crafted signed content; the displayed signature remains valid while attacker-chosen text is hidden, enabling signed text from another context to masquerade as an email.
The record
- CVE
- CVE-2023-50762
- Published
- Dec 19, 2023
- Updated
- Feb 13, 2025
- Vendor
- Mozilla
- Product
- Thunderbird
- Classifications
- T1036
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 19, 2023CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=unspecified <115.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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Your stack
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