Comment 2 for bug 4430

Yes it is now a security update according to Macromedia advisory:

http://www.macromedia.com/devnet/security/security_zone/mpsb05-07.html

Interestingly, when I first opened this bug report 2 days ago, That advisory was stating that only Flash 7.0.19 and earlier was vulnerable (Debian/Ubuntu are at 7.0.25). but in the last 48 hours they have changed the text of their document such that now it seems 7.0.53 and earlier is vulnerable.