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Ruby on Rails 3 is using a CookieStore feature for session management which can result in various vulnerabilities, as described here and here. While it's not guaranteed that these websites are vulnerable or even use Ruby, the cookie name pattern resembles the one used by CookieStore.

Selected (out of total) websites using Ruby CookieStore feature
Website Cookie name
www.stltoday.com _editorials_session
easternwakenews.com _editorials_session
www.elnuevoherald.com _editorials_session
ktbs.com _editorials_session
gosanangelo.com _editorials_session
reporter.net _editorials_session
www.wxyz.com _editorials_session
www.sacbee.com _editorials_session
losangeles.cbslocal.com _editorials_session
www.fresnobee.com _editorials_session
washington.cbslocal.com _editorials_session
mtstandard.com _editorials_session
napavalleyregister.com _editorials_session
www.stltoday.com _editorials_session
www.miamiherald.com _editorials_session
trib.com _editorials_session
lakewyliepilot.com _editorials_session
www.macon.com _editorials_session
herald-review.com _editorials_session
www.elnuevoherald.com _editorials_session
charlotte.com _editorials_session
www.pressrepublican.com _editorials_session
www.redding.com _editorials_session
www.theindychannel.com _editorials_session
www.sacbee.com _editorials_session
miami.cbslocal.com _editorials_session
timeswv.com _editorials_session
www.vcstar.com _editorials_session
itemonline.com _editorials_session
billingsgazette.com _editorials_session
www.naplesnews.com _editorials_session
newyork.cbslocal.com _editorials_session
idahostatejournal.com _editorials_session
www.wptv.com _editorials_session
www.miamiherald.com _editorials_session
www.abc15.com _editorials_session
bradenton.com _editorials_session
www.kansascity.com _editorials_session
timesenterprise.com _editorials_session
www.kansas.com _editorials_session
www.wdbj7.com _editorials_session
www.newsobserver.com _editorials_session
newyork.cbslocal.com _editorials_session
www.mrtimes.com _editorials_session
missoulian.com _editorials_session
www.wctv.tv _editorials_session
www.auburnjournal.com _editorials_session
herald.com _editorials_session
www.sacbee.com _editorials_session
www.centralctcommunications.com _editorials_session
columbustelegram.com _editorials_session
enewscourier.com _editorials_session
www.joplinglobe.com _editorials_session
api.circularhub.com _editorials_session
www.stltoday.com _editorials_session
detroit.cbslocal.com _editorials_session
www.sacbee.com _editorials_session
www.philly.com _editorials_session
bradenton.com _editorials_session
www.heraldbulletin.com _editorials_session
www.kansascity.com _editorials_session
www.newsobserver.com _editorials_session
cbcnewmedia.com _editorials_session
onlineathens.com _editorials_session
www.miamiherald.com _editorials_session
detroit.cbslocal.com _editorials_session
www.bostonglobe.com _editorials_session
thesnaponline.com _editorials_session
thedurhamnews.com _editorials_session
losangeles.cbslocal.com _editorials_session
www.charlotteobserver.com _editorials_session
azstarnet.com _editorials_session
www.petaluma360.com _editorials_session
tucson.com _editorials_session
rapidcityjournal.com _editorials_session
www.stltoday.com _editorials_session
www.wcpo.com _editorials_session
www.aberdeennews.com _editorials_session
www.wcpo.com _editorials_session
www.newsobserver.com _editorials_session
journalstar.com _editorials_session
tmnews.com _editorials_session
www.joplinglobe.com _editorials_session
www.miamiherald.com _editorials_session
www.newsnet5.com _editorials_session
www.heraldonline.com _editorials_session
abc15.com _editorials_session
www.kansascity.com _editorials_session
www.palestineherald.com _editorials_session
goshennews.com _editorials_session
www.sacbee.com _editorials_session
www.kansas.com _editorials_session
www.philly.com _editorials_session
www.salemnews.com _editorials_session
www.pasadenastarnews.com _editorials_session
kionrightnow.com _editorials_session
newyork.cbslocal.com _editorials_session
www.kansascity.com _editorials_session
www.thestate.com _editorials_session
crowdsavings.com _editorials_session