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Post SMTP

37known security flaws found in Post SMTP
since February 2021

Safe from 4.0.2

Version 4.0.2 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: Forged requests, February 2021Minor: Forged requests, March 2021Minor: Cross-site scripting, August 2022Major: Server side request forgery, September 2022Advisory: a security flaw, June 2023Minor: Forged requests, June 2023Major: Forged requests, June 2023Minor: Cross-site scripting, July 2023Major: Cross-site scripting, July 2023Advisory: Database injection, October 2023Advisory: Database injection, October 2023Minor: Cross-site scripting, November 2023Major: Database injection, December 2023Minor: Cross-site scripting, January 2024Minor: Cross-site scripting, January 2024Minor: Cross-site scripting, January 2024Major: Missing checks, January 2024Dangerous: Missing checks, January 2024Major: Cross-site scripting, March 2024Major: Database injection, May 2024Major: Database injection, November 2024Minor: Missing checks, January 2025Minor: Cross-site scripting, February 2025Minor: Database injection, March 2025Major: Missing checks, July 2025Minor: a security flaw, September 2025Dangerous: Missing checks, October 2025Minor: Missing checks, December 2025Minor: Missing checks, December 2025Advisory: Cross-site scripting, March 2026Advisory: a security flaw, March 2026Minor: Cross-site scripting, April 2026Major: Cross-site scripting, April 2026Minor: Missing checks, May 2026Major: Cross-site scripting, August 2026202120222023202420252026

DangerousMajorMinorAdvisory

What they could let someone do.

What could happen

  • 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
  • Database injection

    Someone could read or change what is in the site's database: customer details, orders, password records, or a new administrator account.

    How: The software builds its questions to the database out of what visitors type, so carefully written input changes the question itself.

    Read about it here
Every known flaw, newest first (37)
  1. August 2026MajorCross-site scriptingFixed in 4.0.2. No login needed.
  2. May 2026MinorMissing checksFixed in 4.0.1. Needs a login on the site.
  3. April 2026MinorCross-site scriptingFixed in 3.1.0. No login needed.
  4. April 2026MajorCross-site scriptingFixed in 3.6.3. No login needed.
  5. March 2026AdvisoryCross-site scriptingFixed in 3.9.0. No login needed.
  6. March 2026AdvisoryA security flawFixed in 3.9.0. Needs a login on the site (Subscriber+).
  7. December 2025MinorMissing checksFixed in 3.6.2. No login needed.
  8. December 2025MinorMissing checksFixed in 3.6.2. Needs a login on the site (Subscriber+).
  9. October 2025DangerousMissing checksFixed in 3.6.1. No login needed.
  10. September 2025MinorA security flawFixed in 3.4.2. Needs a login on the site (Subscriber+).
  11. July 2025MajorMissing checksFixed in 3.3.0. Needs a login on the site (Subscriber+).
  12. March 2025MinorDatabase injectionFixed in 3.1.3. Needs a login on the site (Administrator+).
  13. February 2025MinorCross-site scriptingFixed in 3.1.0. No login needed.
  14. January 2025MinorMissing checksFixed in 2.9.12. Needs a login on the site.
  15. November 2024MajorDatabase injectionFixed in 2.9.10. Needs a login on the site.
  16. May 2024MajorDatabase injectionFixed in 2.9.4. Needs a login on the site (Administrator+).
  17. March 2024MajorCross-site scriptingFixed in 2.8.7. No login needed.
  18. January 2024DangerousMissing checksFixed in 2.8.8. No login needed.
  19. January 2024MajorMissing checksFixed in 2.8.7. No login needed.
  20. January 2024MinorCross-site scriptingFixed in 2.8.7. No login needed.
  21. January 2024MinorCross-site scriptingFixed in 2.8.7. No login needed.
  22. January 2024MinorCross-site scriptingFixed in 2.8.8. Needs a login on the site.
  23. December 2023MajorDatabase injectionFixed in 2.8.7. Needs a login on the site.
  24. November 2023MinorCross-site scriptingFixed in 2.7.1. No login needed.
  25. October 2023AdvisoryDatabase injectionFixed in 2.6.1.
  26. October 2023AdvisoryDatabase injectionFixed in 2.6.1. Needs a login on the site (Administrator+).
  27. July 2023MajorCross-site scriptingFixed in 2.5.8. No login needed.
  28. July 2023MinorCross-site scriptingFixed in 2.5.8. No login needed.
  29. June 2023MinorForged requestsFixed in 2.5.7. No login needed.
  30. June 2023MajorForged requestsFixed in 2.5.7. No login needed.
  31. June 2023AdvisoryA security flawFixed in 2.0.21.
  32. September 2022MajorServer side request forgeryFixed in 2.1.7. Needs a login on the site.
  33. August 2022MinorCross-site scriptingFixed in 2.1.4. Needs a login on the site (Admin+).
  34. March 2021MinorForged requestsFixed in 2.0.21. No login needed.
  35. February 2021AdvisoryForged requestsFixed in 2.0.21.
  36. Date not knownAdvisoryA security flawFixed in 2.0.21.
  37. Date not knownAdvisoryDatabase injectionFixed in 2.6.1. Needs a login on the site (Administrator+).

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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