easyXDM 2.5 allows XSS via the xdm_e parameter.

Cross-site Scripting (XSS) in EasyXDM before 2.4.18 allows remote attackers to inject arbitrary web script or html via the easyxdm.swf file.

An issue was discovered in Open XDMoD through 7.5.0. html/gui/general/login.php has Reflected XSS via the xd_user_formal_name parameter.

An issue was discovered in Open XDMoD through 7.5.0. html/gui/general/dl_publication.php allows Path traversal via the file parameter, allowing remote attackers to read PDF files in arbitrary directories.

An issue was discovered in Open XDMoD through 7.5.0. An authentication bypass (account takeover) exists due to a weak password reset mechanism. A brute-force attack against an MD5 rid value requires only 600 guesses in the plausible situation where the attacker knows that the victim has started a password-reset process (pass_reset.php, password_reset.php, XDUser.php) in the past few minutes.

It was discovered that libXdmcp before 1.1.2 including used weak entropy to generate session keys. On a multi-user system using xdmcp, a local attacker could potentially use information available from the process list to brute force the key, allowing them to hijack other users' sessions.

LXDM before 0.5.2 did not start X server with -auth, which allows local users to bypass authentication with X connections.

Cross-site scripting (XSS) vulnerability in name.html in easyXDM before 2.4.19 allows remote attackers to inject arbitrary web script or HTML via the location.hash value.

The Xsession script, as used by X Display Manager (xdm) in NetBSD before 20060212, X.Org before 20060317, and Solaris 8 through 10 before 20061006, allows local users to overwrite arbitrary files, or read another user's Xsession errors file, via a symlink attack on a /tmp/xses-$USER file.

X.Org and XFree86, including libX11, xdm, xf86dga, xinit, xload, xtrans, and xterm, does not check the return values for setuid and seteuid calls when attempting to drop privileges, which might allow local users to gain privileges by causing those calls to fail, such as by exceeding a ulimit.