| Package | Affected versions | Patched versions |
|---|---|---|
| thunderbird | = 0.8= 1.7.1= 1.7.3 |
Mozilla Mail 1.7.1 and 1.7.3, and Thunderbird before 0.9, when HTML-Mails is enabled, allows remote attackers to determine valid e-mail addresses via an HTML e-mail that references a Cascading Style Sheets (CSS) document on the attacker's server.
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