When configuring a web application to use only ssl (e. g. by forwarding all http-requests to https), a user would expect that sniffing and hijacking the session is impossible.
Though, for this to be secure, one needs to set the session cookie to have the secure flag. Else the cookie will be transferred through http if the victim's browser does a single http-request on the same domain.
gallery versions before 2.2.6 did not set this flag.
2008-08-15: Vendor contacted
2008-09-18 Vendor releases 2.2.6
2008-09-18 Published advisory
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-3662 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.
This vulnerability was discovered by Hanno Boeck of schokokeks.org webhosting. It's licensed under the creative commons attribution license.
Hanno Boeck, 2008-09-18, http://www.hboeck.de