DescriptionWordPress before 4.9.2 has XSS in the Flash fallback files in MediaElement (under wp-includes/js/mediaelement).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs887596

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
wordpress (PTS)jessie4.1+dfsg-1+deb8u17fixed
jessie (security)4.1.26+dfsg-1+deb8u1fixed
stretch (security), stretch4.7.5+dfsg-2+deb9u5fixed
bullseye, buster5.0.4+dfsg1-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
wordpresssourcejessie(not affected)
wordpresssourcestretch(not affected)
wordpresssourcewheezy(not affected)


[stretch] - wordpress <not-affected> (Vulnerable files have been removed before)
[jessie] - wordpress <not-affected> (Vulnerable files have been removed before)
[wheezy] - wordpress <not-affected> (Vulnerable files have been removed before)
For jessie and stretch version the files silverlightmediaelement.xap and
flashmediaelement.swf have been removed with the 4.1+dfsg-1 version.
sid in version 4.9.1+dfsg-1 did as well *not* have the files but track here the
final wordpress version 4.9.2 which finally removed the mediaelement files.

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