What is Composr CMS?

Composr is a very flexible CMS with advanced social, interactive and dynamic functionality.

Hundreds of features are available out of the box, as well as building blocks, and further addons (think multi-channel content delivery).

Composr is embraced by Fortune-100 companies, government agencies, and small startups. We make all the best ideas available to everyone.

Create smarter web properties; accelerate      time to market
  • Huge integrated feature-set
  • Enthusiastic community
  • No licensing costs
  • Cloud-compatible
  • HTML5, CSS3, WCAG

Tutorial Library

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Latest News

Composr 10.1 beta22 released

2nd February 2020, 10:40 pm

10.1 beta22 released. Read the full article for more information, and upgrade information.

Composr 10.0.30 released

30th January 2020, 2:50 am

10.0.30 released. Read the full article for more information, and upgrade information.

Composr 10.1 beta21 released

16th December 2019, 3:43 pm

10.1 beta21 released. Read the full article for more information, and upgrade information.

Composr 10.0.29 released

16th December 2019, 1:51 pm

10.0.29 released. Read the full article for more information, and upgrade information.

XSS via mime sniffing on .dat files

26th September 2019, 3:48 am

There is a vulnerability in Composr's storage of uploads as .dat files on servers. A hacker could plant code with JavaScript, then trick an administrator to running it on their machine.

This is a low-to-medium risk vulnerability. With planning, creativity, and coordination, this could result in a hacker attaining various malicious outcomes. JavaScript code does not have access to files on a user's own computer, but it can be used to automate privileged web page actions on the website it is running on.

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