(Bug 39700) Wikipedia administrator Writ Keeper discovered
a stored XSS (HTML injection) vulnerability. This was
possible due to the handling of link text on File: links for
nonexistent files. MediaWiki 1.16 and later is affected.
(Bug 39180) User Fomafix reported several DOM-based XSS
vulnerabilities, made possible by a combination of loose
filtering of the uselang parameter, and JavaScript gadgets
on various language Wikipedias.
(Bug 39180) During internal review, it was discovered that
CSRF tokens, available via the api, were not protected with
X-Frame-Options headers. This could lead to a CSRF vulnerability
if the API response is embedded in an external website using
using an iframe.
(Bug 39824) During internal review, it was discovered extensions
were not always allowed to prevent the account creation action.
This allowed users blocked by the GlobalBlocking extension to
create accounts.
(Bug 39184) During internal review, it was discovered that
password data was always saved to the local MediaWiki database
even if authentication was handled by an extension, such as LDAP.
This could allow a compromised MediaWiki installation to leak
information about user's LDAP passwords. Additionally, in situations
when an authentication plugin returned false in its strict
function, this would allow old passwords to be used for accounts
that did not exist in the external system, indefinitely.
(Bug 39823) During internal review, it was discovered that metadata
about blocks, hidden by a user with suppression rights, was visible
to administrators.