Thunderbird OpenPGP inline decryption CSS-based content exfiltration
When a user explicitly requests Thunderbird to decrypt an inline OpenPGP message embedded within a text section of an email that is formatted/styled with HTML/CSS, Thunderbird renders the decrypted plaintext in a context where the outer message’s CSS remains active. If the user also allows loading of remote content referenced by the outer email, an attacker can craft the email (using CSS rules plus fonts/animations) to exfiltrate the decrypted secret content. Affected versions: Thunderbird < 147.0.1 and Thunderbird < 140.7.1.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
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Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.