CVE-2017-17848: Debian Linux

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

An issue was discovered in Enigmail before 1.9.9. In a variant of CVE-2017-17847, signature spoofing is possible for multipart/related messages because a signed message part can be referenced with a cid: URI but not actually displayed. In other words, the entire containing message appears to be signed, but the recipient does not see any of the signed text.

Affected products

• Debian Debian Linux: version 7.0 only; version 8.0 only; version 9.0 only
• Enigmail Enigmail: before 1.9.9 (fixed in 1.9.9)

Published 2017-12-27. Last modified 2026-06-17.