The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. NOTE: third parties report that this is a problem in applications that mishandle the Modification Detection Code (MDC) feature or accept an obsolete packet type, not a problem in the OpenPGP specification

The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL.

Multiple cross-site scripting (XSS) vulnerabilities in Horde IMP before 4.2.2 and 4.3.3 allow remote attackers to inject arbitrary web script or HTML via unspecified vectors to (1) smime.php, (2) pgp.php, and (3) message.php.

IMP Webmail Client 4.1.5, Horde Application Framework 3.1.5, and Horde Groupware Webmail Edition 1.0.3 does not validate unspecified HTTP requests, which allows remote attackers to (1) delete arbitrary e-mail messages via a modified numeric ID or (2) "purge" deleted emails via a crafted email message.

Argument injection vulnerability in the cleanup cron script in Horde Project Horde and IMP before Horde Application Framework 3.1.4 allows local users to delete arbitrary files and possibly gain privileges via multiple space-delimited pathnames.

Cross-site scripting (XSS) vulnerability in horde/imp/search.php in Horde IMP H3 before 4.1.3 allows remote attackers to include arbitrary web script or HTML via multiple unspecified vectors related to folder names, as injected into the vfolder_label form field in the IMP search screen.

Cross-site scripting vulnerability in status.php3 for IMP 2.2.8 and HORDE 1.2.7 allows remote attackers to execute arbitrary web script and steal cookies of other IMP/HORDE users via the script parameter.