The plugin register. Used on 900,000+ sites
W3 Total Cache
59known security flaws found in W3 Total Cache
since May 2013
Safe from 2.11.0
Version 2.11.0 or later fixes all of them. A site on an older version is open to them.
Or let us look for you
When they were found.
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 - 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 - Reading files
Someone could read files on the server they should never see, such as the settings file holding the database password, or delete files the site needs.
How: The software takes a file name from a request and does not check that it stays inside its own folder.
Read about it here
Every known flaw, newest first (59)
- October 2026MajorCross-site scriptingFixed in 2.11.0. No login needed.
- October 2026AdvisoryReading filesFixed in 2.10.6.
- September 2026MajorCross-site scriptingFixed in 2.10.7. No login needed.
- August 2026MajorCross-site scriptingFixed in 2.10.6. No login needed.
- August 2026AdvisoryReading filesFixed in 2.10.5. No login needed.
- August 2026MajorCross-site scriptingFixed in 2.10.4. No login needed.
- July 2026MinorReading filesFixed in 2.10.3. No login needed.
- July 2026MajorReading filesFixed in 2.10.0. No login needed.
- June 2026DangerousRunning codeFixed in 2.10.0. No login needed.
- April 2026AdvisoryRunning codeFixed in 2.9.4. No login needed.
- March 2026MinorMissing checksFixed in 2.9.2. Needs a login on the site.
- February 2026DangerousRunning codeFixed in 2.9.2. No login needed.
- October 2025AdvisoryRunning codeFixed in 2.8.13. No login needed.
- January 2025MinorInformation leakFixed in 2.8.2. No login needed.
- January 2025MinorMissing checksFixed in 2.8.2. No login needed.
- January 2025MajorMissing checksFixed in 2.8.2. Needs a login on the site (Subscriber+).
- September 2024MajorInformation leakFixed in 2.7.6. No login needed.
- June 2022MajorInformation leakFixed in 2.2.3. Needs a login on the site.
- June 2021MinorCross-site scriptingFixed in 2.1.5. No login needed.
- June 2021MinorCross-site scriptingFixed in 2.1.4. No login needed.
- April 2021MinorCross-site scriptingFixed in 2.1.3. Needs a login on the site.
- November 2019MajorInformation leakFixed in 0.9.2.5. No login needed.
- November 2019MajorInformation leakFixed in 0.9.2.5. No login needed.
- November 2019MajorInformation leakFixed in 0.9.2.5. No login needed.
- May 2019AdvisoryServer side request forgeryFixed in 0.9.7.4.
- May 2019AdvisoryCross-site scriptingFixed in 0.9.7.4.
- May 2019AdvisoryA security flawFixed in 0.9.7.4.
- May 2019AdvisoryCross-site scriptingFixed in 0.9.7.4.
- April 2019MajorReading filesFixed in 0.9.4. No login needed.
- November 2016AdvisoryKnocking it overFixed in 0.9.5.
- October 2016AdvisoryServer side request forgeryFixed in 0.9.5.
- September 2016AdvisoryA security flawFixed in 0.9.5.
- September 2016AdvisoryRunning codeFixed in 0.9.5.
- September 2016AdvisoryReading filesFixed in 0.9.5.
- September 2016AdvisoryA security flawFixed in 0.9.5.
- September 2016AdvisoryA security flawFixed in 0.9.5.
- September 2016AdvisoryMissing checksFixed in 0.9.5.
- September 2016AdvisoryRunning codeFixed in 0.9.5.
- September 2016AdvisoryReading filesFixed in 0.9.5.
- September 2016AdvisoryRunning codeFixed in 0.9.5.
- July 2016AdvisoryCross-site scriptingFixed in 0.9.5.
- May 2015AdvisoryForged requestsFixed in 0.9.4.1.
- November 2014AdvisoryCross-site scriptingFixed in 0.9.4.1.
- September 2014AdvisoryForged requestsFixed in 0.9.4.1.
- September 2014AdvisoryForged requestsFixed in 0.9.4.1.
- August 2014DangerousRunning codeFixed in 0.9.2.9. No login needed.
- May 2013AdvisoryRunning codeFixed in 0.9.2.9.
- Date not knownAdvisoryA security flawFixed in 0.9.7.4.
- Date not knownAdvisoryA security flawFixed in 0.9.7.4.
- Date not knownAdvisoryCross-site scriptingFixed in 0.9.7.4.
- Date not knownAdvisoryA security flawFixed in 0.9.5.
- Date not knownAdvisoryInformation leakFixed in 0.9.5.
- Date not knownAdvisoryServer side request forgeryFixed in 0.9.5. No login needed.
- Date not knownAdvisoryA security flawFixed in 0.9.5.
- Date not knownAdvisoryA security flawFixed in 0.9.5.
- Date not knownAdvisoryA security flawFixed in 0.9.5.
- Date not knownAdvisoryA security flawFixed in 0.9.5. No login needed.
- Date not knownAdvisoryCross-site scriptingFixed in 0.9.5.
- Date not knownAdvisoryForged requestsFixed in 0.9.4.1.
From the public lists of known flaws, checked daily. A flaw is listed once it is made public, often after a fix is out.
Be told the day a new one is found.
Mendbird checks your site every morning against the lists of known flaws, and emails you in plain English the day one hits something you run. Free for 14 days, then £9 a month.