All-in-one free web application security tool. Web application vulnerability and privacy scanner with support for HTTP cookies, Flash, HTML5 localStorage, sessionStorage, CANVAS, Supercookies, Evercookies. Includes a free SSL/TLS, HTML and HTTP vulnerability scanner and URL malware scanner.

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
kron4.com _editorials_session
toronto.ctvnews.ca _editorials_session
nationalpostcom.files.wordpress.com _editorials_session
www.nationalpost.com _editorials_session
kron4.com _editorials_session
nationalpost.com _editorials_session
sltrib.com _editorials_session
thetimes-tribune.com _editorials_session
www.sentinel-echo.com _editorials_session
www.sentinel-echo.com _editorials_session
www.washtimesherald.com _editorials_session
www.washtimesherald.com _editorials_session
sentinel-echo.com _editorials_session
washtimesherald.com _editorials_session
sentinel-echo.com _editorials_session
washtimesherald.com _editorials_session
www.starbeacon.com _editorials_session
www.starbeacon.com _editorials_session
starbeacon.com _editorials_session
starbeacon.com _editorials_session
www.kivitv.com _editorials_session
www.kivitv.com _editorials_session
www.aikenstandard.com _editorials_session
www.itemonline.com _editorials_session
circular-modules.wcbi.com _editorials_session
www.wcbi.com _editorials_session
slam.canoe.com _editorials_session
www.kyma.com _editorials_session
www.meridianstar.com _editorials_session
www.stwnewspress.com _editorials_session
www.krdo.com _editorials_session
www.ctvnews.ca _editorials_session
www.news8000.com _editorials_session
www.enidnews.com _editorials_session
www.ktvz.com _editorials_session
www.newsoptimist.ca _editorials_session
www.newspressnow.com _editorials_session
republicanherald.com _editorials_session
www.fox47news.com _editorials_session
circular-modules.wdef.com _editorials_session
www.wdef.com _editorials_session
www.theadvocate.com _editorials_session
www.bnd.com _editorials_session
editorials.merchants.wishabi.ca _editorials_session
editorials.merchants.wishabi.ca _editorials_session
www.1011now.com _editorials_session
london.ctvnews.ca _editorials_session
www.brownsvilleherald.com _editorials_session
www.oaoa.com _editorials_session
www.tbo.com _editorials_session
www.localnews8.com _editorials_session
www.ktnv.com _editorials_session
api.circularhub.com _editorials_session
api.circularhub.com _editorials_session
www.whec.com _editorials_session
api.flyertown.ca _editorials_session
api.flyertown.ca _editorials_session
www.stltoday.com _editorials_session
easternwakenews.com _editorials_session
www.leaderpost.com _editorials_session
o.canada.com _editorials_session
www.elnuevoherald.com _editorials_session
dfw.cbslocal.com _editorials_session
radio.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
losangeles.cbslocal.com _editorials_session
www.fresnobee.com _editorials_session
washington.cbslocal.com _editorials_session
mtstandard.com _editorials_session
globalnews.ca _editorials_session
globalnews.ca _editorials_session
napavalleyregister.com _editorials_session
www.theprovince.com _editorials_session
o.canada.com _editorials_session
api.flyertown.ca _editorials_session
www.stltoday.com _editorials_session
www.theprovince.com _editorials_session
mitchellrepublic.com _editorials_session
www.miamiherald.com _editorials_session
trib.com _editorials_session
globalnews.ca _editorials_session
lakewyliepilot.com _editorials_session
post-gazette.com _editorials_session
www.macon.com _editorials_session
herald-review.com _editorials_session
globalnews.ca _editorials_session
www.elnuevoherald.com _editorials_session
www.calgaryherald.com _editorials_session
charlotte.com _editorials_session
globalnews.ca _editorials_session
london.ctvnews.ca _editorials_session
www.pressrepublican.com _editorials_session
www.redding.com _editorials_session
www.theindychannel.com _editorials_session
www.sacbee.com _editorials_session