[horde] PGP vulnerability

[Arjen de Korte]

Regarding below warning from the EFF:

https://www.eff.org/deeplinks/2018/05/attention-pgp-users-new-vulnerabilities-require-you-take-action-now

Based on the limited information available today, I assume this has  
something to do with a crafted message that somehow discloses the  
private key to an attacker. Does anybody know if besides the plugins  
mentioned in this article, other applications (Horde for instance) are  
affected as well?