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Cloudflare

5known security flaws found in Cloudflare
since March 2016

Safe from 4.12.3

One has been used in real attacks. Version 4.12.3 or later fixes all of them. A site on an older version is open to them.

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When they were found.

Advisory: a security flaw, March 2016Advisory: Cross-site scripting, March 2016Dangerous: Running code, June 2017Minor: Missing checks, January 2024201620182020202220242026

DangerousMajorMinorAdvisory

What they could let someone do.

What could happen

  • Running code

    Someone could run their own code on the server and take the site over: add malware, send spam, steal data, or use it to attack others.

    How: Part of the software treats something it was sent as instructions to follow, or keeps an uploaded file somewhere it can be run.

    Read about it here
  • Missing checks

    Someone could do things only an administrator should: change settings, see private data, or give themselves more rights.

    How: Part of the software forgets to check who is asking before it does what was asked.

    Read about it here
  • Cross-site scripting

    Someone could make your pages run their own script in visitors' browsers, to steal logins, show a fake payment form or send people to a scam site.

    How: The software puts text it was sent back onto a page without making it safe first, so a script hidden in a link, form or comment runs as if it were part of your site.

    Read about it here
Every known flaw, newest first (5)
  1. January 2024MinorMissing checksFixed in 4.12.3. Needs a login on the site.
  2. June 2017DangerousRunning codeFixed in 1.1.12. No login needed. Used in real attacks.
  3. March 2016AdvisoryA security flawFixed in 1.3.21.
  4. March 2016AdvisoryCross-site scriptingFixed in 1.3.21.
  5. Date not knownAdvisoryCross-site scriptingFixed in 1.3.21.

From the public lists of known flaws, checked daily. A flaw is listed once it is made public, often after a fix is out.

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