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

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Latest News

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.

Illicit access to stats graphs

26th September 2019, 3:48 am

Composr uses SVG for rendering out stats graphs. When stats are viewed in the Admin Zone, Composr will generate the .xml files onto disk, and then embed those files. However, the URLs to the files are predictable and not access-protected.

This is a low risk vulnerability. While illicit access to stats graphs is not acceptable, there are no wider known repercussions and similar data may be available via third-party tools anyway (such as Alexa).

Information leak on IIS

26th September 2019, 3:48 am

Hackers may directly access the URLs to various on-disk files due to lack of protection for IIS users that is built in for Apache users.
Such files include the raw source code of pages, raw templates, and raw language files.

This is a low-to-medium risk vulnerability. The majority of users are not hiding privileged content with guessable page names in Comcode pages, but for those that are, this is a concern. Access to raw templates and language files would rarely be a concern.

Composr 10.0.28 released

26th September 2019, 3:41 am

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

Overhaul of project messaging

10th September 2019, 1:08 am

A number of development practices have been overhauled around how development work is messaged. This is to improve communication to Composr users and also within the development team.

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