Updated xorg-server packages has been released for CentOS 5-7:

CESA-2014:1982 Important CentOS 5 xorg-x11-server Security Update
CESA-2014:1983 Important CentOS 6 xorg-x11-server Security Update
CESA-2014:1983 Important CentOS 7 xorg-x11-server Security Update

CESA-2014:1982 Important CentOS 5 xorg-x11-server Security Update

CentOS Errata and Security Advisory 2014:1982 Important

Upstream details at : https://rhn.redhat.com/errata/RHSA-2014-1982.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
5dd80e2481123790224cc7df93fc98bfc8baba76a2a3cb63eadb14a69fbf02d3 xorg-x11-server-sdk-1.1.1-48.107.el5.centos.i386.rpm
7f733fa86c72b17aa8a0bc788e91c740309ec4b0ef3ed73482223e5ea8191381 xorg-x11-server-Xdmx-1.1.1-48.107.el5.centos.i386.rpm
f0596bbdb393a38da97ae46fcd4b331dc42cc177ba9164352e89a94278912eb1 xorg-x11-server-Xephyr-1.1.1-48.107.el5.centos.i386.rpm
610c1201621a884c91282fa85b7be50cfd10562e6c253071b9cad8f323d5b689 xorg-x11-server-Xnest-1.1.1-48.107.el5.centos.i386.rpm
e986009d6251adf4c6a406182bd0a22b213973d3772c02577f8b952349b1bdb8 xorg-x11-server-Xorg-1.1.1-48.107.el5.centos.i386.rpm
89b2a6f71fca40072cfaf49770f62b70d791c5d5d494e1ad50352a2dd741ea3c xorg-x11-server-Xvfb-1.1.1-48.107.el5.centos.i386.rpm
2a44d8e7c55018b6be4ee53f75cb14e114f695c01eb9542ddc6f4d4f2f2c6618 xorg-x11-server-Xvnc-source-1.1.1-48.107.el5.centos.i386.rpm

x86_64:
5b9e22aac4dc24bf7c0f8a9d51cad704ad239f77ff704febaae793484ad1ec54 xorg-x11-server-sdk-1.1.1-48.107.el5.centos.x86_64.rpm
924778dee3e0f5426da8ad0b21746ae64e107d124b11531842ee2b010c19e731 xorg-x11-server-Xdmx-1.1.1-48.107.el5.centos.x86_64.rpm
c0eb82c79ce280ff69142474b6be999d2494735b9fe8867162612437ca4e4379 xorg-x11-server-Xephyr-1.1.1-48.107.el5.centos.x86_64.rpm
b58f49b971a9e54af9357c2832b2565207e5d014da448b96f45c699c9575bda2 xorg-x11-server-Xnest-1.1.1-48.107.el5.centos.x86_64.rpm
b46b61dc9b18ead84233ef4edfbe1d604542ae880bcd9e8031aba20ed62849f1 xorg-x11-server-Xorg-1.1.1-48.107.el5.centos.x86_64.rpm
29a6193b018e329ef80e31b24c1baf480484238950feab82e7b7f3dd3495c80a xorg-x11-server-Xvfb-1.1.1-48.107.el5.centos.x86_64.rpm
a44f21064669fd5dd89708076e290e409f721a2326b2c6e4ebb39e8d919ed24f xorg-x11-server-Xvnc-source-1.1.1-48.107.el5.centos.x86_64.rpm

Source:
48017e055ed5bc6b794f079d08be03deeb3bebedb6b81f02909bec7080a26824 xorg-x11-server-1.1.1-48.107.el5.centos.src.rpm

CESA-2014:1983 Important CentOS 6 xorg-x11-server Security Update

CentOS Errata and Security Advisory 2014:1983 Important

Upstream details at : https://rhn.redhat.com/errata/RHSA-2014-1983.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
1cb2224fc013295b5042d713fdaae6349496ca3d2f5de1e7ce42681b916285be xorg-x11-server-common-1.15.0-25.el6.centos.i686.rpm
01177dfc3535dfdaa9ec8f98a4bdd04844ba68e48d988b527ed7ce93f6b2813e xorg-x11-server-devel-1.15.0-25.el6.centos.i686.rpm
6448e887e79abc49858f375f6b6d06d2ce2457e9bc22258905564a928379a3be xorg-x11-server-source-1.15.0-25.el6.centos.noarch.rpm
2aa96df0893dc95e2b4a8d5d1f4d351ffdbb905e9bc76f05e59ed7525825bbbd xorg-x11-server-Xdmx-1.15.0-25.el6.centos.i686.rpm
fdeab91ace635d3597f65ac8d4b9ea3dcbec4ce0264ae55da8198cd5e1ae2e36 xorg-x11-server-Xephyr-1.15.0-25.el6.centos.i686.rpm
a75d058bff4c02ea99b91b0aaf8c9e948c075ae3c1bcb97c19588e6b85dd34cb xorg-x11-server-Xnest-1.15.0-25.el6.centos.i686.rpm
472c8f083c5497f770bd328cfb08195f78f8754f2a54e9846e414f2ec74aa5e3 xorg-x11-server-Xorg-1.15.0-25.el6.centos.i686.rpm
0fcf1bc4ea8fd6f81fbc84355b6bd92682fb24f0d306be4ac1bc7e6ebc556746 xorg-x11-server-Xvfb-1.15.0-25.el6.centos.i686.rpm

x86_64:
ffa3f3eb3121fbe7443b99ab6427408e7d5b07f7dc90f4e69d509317b61ef575 xorg-x11-server-common-1.15.0-25.el6.centos.x86_64.rpm
01177dfc3535dfdaa9ec8f98a4bdd04844ba68e48d988b527ed7ce93f6b2813e xorg-x11-server-devel-1.15.0-25.el6.centos.i686.rpm
fad7ee011bdf3578d43d6a0c51049f70231854c2e8af75d6e7ea0720f3e9fbff xorg-x11-server-devel-1.15.0-25.el6.centos.x86_64.rpm
6448e887e79abc49858f375f6b6d06d2ce2457e9bc22258905564a928379a3be xorg-x11-server-source-1.15.0-25.el6.centos.noarch.rpm
88693534bf3687c73687a550076812a5bd9e62caccc4cc724866bbac0367f5fe xorg-x11-server-Xdmx-1.15.0-25.el6.centos.x86_64.rpm
613095bd35b10e11c979583675b07c5e445e20782a98d83628b17b8aef23b799 xorg-x11-server-Xephyr-1.15.0-25.el6.centos.x86_64.rpm
ee0d3c0ac412f2d83234f10daf316b2d98a70ba4a5289ce8907798e06a1e6957 xorg-x11-server-Xnest-1.15.0-25.el6.centos.x86_64.rpm
b1133e1cfe896b8a4669151b714d0752cfdcfc94530596a4be428f06bc56b99f xorg-x11-server-Xorg-1.15.0-25.el6.centos.x86_64.rpm
dc62fffc97d92c798336e0d6ef06432119d3b0955b69b4168a8cc182658225dd xorg-x11-server-Xvfb-1.15.0-25.el6.centos.x86_64.rpm

Source:
3a3d8b53d889295767ef646f3805c4ae75919082afc62fd107c87c14b4eebc1c xorg-x11-server-1.15.0-25.el6.centos.src.rpm

CESA-2014:1983 Important CentOS 7 xorg-x11-server Security Update

CentOS Errata and Security Advisory 2014:1983 Important

Upstream details at : https://rhn.redhat.com/errata/RHSA-2014-1983.html

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
25c346880f3748436057b98c8abdb4983348d929488d2e92f2d1a4df4702ea87 xorg-x11-server-common-1.15.0-7.el7_0.3.x86_64.rpm
27d1e743db0018993426ccdac8e39e8674d6c9c5c8a28ae443d0e6d5cd8544d4 xorg-x11-server-devel-1.15.0-7.el7_0.3.i686.rpm
4533997894d055edd8044deee6576bbde9033dbd93f2c38a245d8fa8a7a466d4 xorg-x11-server-devel-1.15.0-7.el7_0.3.x86_64.rpm
cc215d5a48fd7e0594a0527d58872822e9aab6d6a5e9cf9fb61ca23c3a7e3e23 xorg-x11-server-source-1.15.0-7.el7_0.3.noarch.rpm
3c5308aea94c229d6066a569f29adbd0103619a076e65a5625e27b992284f17f xorg-x11-server-Xdmx-1.15.0-7.el7_0.3.x86_64.rpm
5e019ef3b76e6dec4380bc902d7aa3a56852c5fbbbc3ee066ddb23d2726d0996 xorg-x11-server-Xephyr-1.15.0-7.el7_0.3.x86_64.rpm
2eb7582e057cbf95c6766971592f3eb509d802bca5a235b2358da612ad738e62 xorg-x11-server-Xnest-1.15.0-7.el7_0.3.x86_64.rpm
6497f3b531d7b401ef842b8bf29fc97bb8f95bddbf3871c6e66b0e1899fcade7 xorg-x11-server-Xorg-1.15.0-7.el7_0.3.x86_64.rpm
3f683d130f9c1444b65f7bb76f4eed6a055f86b1605e36bfda4e5db3c3ea6930 xorg-x11-server-Xvfb-1.15.0-7.el7_0.3.x86_64.rpm

Source:
52f2205b6f2f67575d20ada900a33e3a8e826e9f2654a87385fa06e7d23e4b60 xorg-x11-server-1.15.0-7.el7_0.3.src.rpm