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MC4WP

20known security flaws found in MC4WP
since December 2016

Safe from 4.14.1

Version 4.14.1 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: Cross-site scripting, December 2016Minor: Cross-site scripting, December 2016Minor: Cross-site scripting, September 2017Advisory: Cross-site scripting, November 2019Advisory: Forged requests, June 2021Advisory: a security flaw, June 2021Advisory: Forged requests, June 2021Advisory: Open redirect, June 2021Minor: Cross-site scripting, March 2022Advisory: Cross-site scripting, March 2022Minor: Missing checks, December 2023Minor: Cross-site scripting, September 2024Minor: Cross-site scripting, September 2024Advisory: Missing checks, March 2026Minor: Cross-site scripting, March 2026Minor: Cross-site scripting, August 2026201620182020202220242026

DangerousMajorMinorAdvisory

What they could let someone do.

What could happen

  • 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
  • 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
  • Forged requests

    Someone could get a signed in administrator to change something without knowing, such as adding a new admin or changing settings, just by visiting a page.

    How: The software does not check that a change came from its own pages, so another site can quietly send one through the administrator's browser.

    Read about it here
Every known flaw, newest first (20)
  1. August 2026MinorCross-site scriptingFixed in 4.14.1. No login needed.
  2. March 2026AdvisoryMissing checksFixed in 4.12.0. No login needed.
  3. March 2026MinorCross-site scriptingFixed in 4.12.1. Needs a login on the site (Author+).
  4. September 2024MinorCross-site scriptingFixed in 4.9.17. Needs a login on the site (Administrator+).
  5. September 2024MinorCross-site scripting No login needed.
  6. December 2023MinorMissing checksFixed in 4.9.10. No login needed.
  7. March 2022MinorCross-site scriptingFixed in 4.8.7. Needs a login on the site (Admin+).
  8. March 2022AdvisoryCross-site scriptingFixed in 4.8.7.
  9. June 2021AdvisoryForged requestsFixed in 4.8.5.
  10. June 2021AdvisoryA security flawFixed in 4.8.5.
  11. June 2021AdvisoryForged requestsFixed in 4.8.5.
  12. June 2021AdvisoryOpen redirectFixed in 4.8.5.
  13. November 2019AdvisoryCross-site scriptingFixed in 4.1.7.
  14. September 2017MinorCross-site scriptingFixed in 4.1.8. No login needed.
  15. December 2016MinorCross-site scriptingFixed in 4.0.11. No login needed.
  16. December 2016AdvisoryCross-site scriptingFixed in 4.0.11.
  17. Date not knownAdvisoryCross-site scriptingFixed in 4.8.7.
  18. Date not knownAdvisoryForged requestsFixed in 4.8.5.
  19. Date not knownAdvisoryForged requestsFixed in 4.8.5.
  20. Date not knownAdvisoryCross-site scriptingFixed in 4.1.7.

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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