Greetings-

With the security/maintenance release of MediaWiki 1.31.11/1.35.1 [0], we would also like to provide this supplementary announcement of MediaWiki extensions and skins with now-public Phabricator tasks, security patches and backports [1]:

 == Cosmos Skin ==
 + (T265440, CVE-2020-27620) - Mix used of wfMessage() calls with no output mode and Html::rawElement
 < https://gerrit.wikimedia.org/r/q/I738471981be4b394caf65de615e8ee4ab36a9782 >

 == FileImporter ==
 + (T265810, CVE-2020-27621) - uses a WMF IP address, does not include XFF for users using this extension
 < https://gerrit.wikimedia.org/r/q/I24a240253c7a5c66dd493a68e8c23d95a17e1b21 >

 == RandomGameUnit ==
 + (T266400, CVE-2020-27957) - Stored XSS
 < https://gerrit.wikimedia.org/r/q/I497d2076038f75c9eb77e0e250f2af56f5bd2bfc >

 == PollNY ==
 + (T266508, CVE-2020-29003) - Stored XSS
 < https://gerrit.wikimedia.org/r/q/Ic5b8f579c303e9666a0b7d815230e4ce08557027 >

 = CologneBlue ==
 + (T267278, CVE-2020-29002) - XSS vulnerability
 < https://gerrit.wikimedia.org/r/q/Ie798a4f16d0ac2a4871aefeb593d962966aeb6b0 >

 == Push ==
 + (T262724, CVE-2020-29004, CVE-2020-29005) - Push extension exposes login credentials
 < https://gerrit.wikimedia.org/r/q/I15d76536a6cf256417d7e28838e4cdb66245adf5 >

 == PushToWatch ==
 + (T268641, CVE-2020-35626) - classic CSRF
 < https://gerrit.wikimedia.org/r/q/I3f41d8087af2ae22581836f7c32baac97f348044 >

 == SecurePoll ==
 + (T268794, CVE-2020-35624) - SecurePoll should not show the exact time of cast votes publicly
 < https://gerrit.wikimedia.org/r/q/If8e15eb8ce9ec652c06816cbff52bb084fd50e73 >

 == GlobalUsage ==
 + (T268341, CVE-2020-35622) - XSS in SpecialGlobalUsage
 < https://gerrit.wikimedia.org/r/q/I3d4689529c976cff14c9ab218eab67d0c7b9cad6 >

 == Widgets ==
 + (T269718, CVE-2020-35625) - RCE in Widgets extension
 < https://gerrit.wikimedia.org/r/q/Ic899a8b15bc510e61cdacb5c024af2d226a2dbeb >

 == CASAuth ==
 + (T263498, CVE-2020-35623) - Logins to MW with at least one SSO client extension allows masquerading as another user
 < https://github.com/CWRUChielLab/CASAuth/pull/10 >

The Wikimedia Security Team recommends updating these extensions and/or skins to the current master branch or relevant, supported release branch [2] as soon as possible. Some of the referenced Phabricator tasks above _may_ still be private. Unfortunately, when security issues are reported, sometimes sensitive information is exposed and since Phabricator is historical, we cannot make these tasks public without exposing this sensitive information. If you have any additional questions or concerns regarding this update, please feel free to contact security@wikimedia.org or file a security task within Phabricator [3].

[0] https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html
[1] https://phabricator.wikimedia.org/T263810
[2] https://www.mediawiki.org/wiki/Version_lifecycle
[3] https://www.mediawiki.org/wiki/Reporting_security_bugs
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