A group of European researchers supposedly found a set of vulnerabilities in PGP and S/MIME. You can read the full report at efail.de.
However, we need to get a few facts straight:
- PGP is not broken
- Only one type of PGP emails are vulnerable (Secure Email doesn’t support them)
- Secure Group does not use S/MIME
- Even with this discovery, do not disable PGP. You are still far safer with it.