The Point Release Security Co-ordinator (PRSC) is a go-between role, liasing with the Security team, Release team and individual maintenance teams. The brief is to take minor security issues (those which don't justify a DSA) from the Security team, and work with maintainers and the Release team to get fixes into the stable and oldstable releases.
Since there is a stable point release approximately every eight weeks, and an oldstable release approximately every twelve weeks, there is about a six- or ten-week period during which the main co-ordination happens.
You're probably here because you were sent notification that a security problem in your package was handed off to the PRSC.
Getting your fix into stable/oldstable is straightforward:
There is a PRSC tracker at /tracker/<bugnum> (e.g. /tracker/660650) for each bug being tracked.
Please contact jmw AT debian DOT org with questions or corrections to the tracking information.