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Otter Blocks

19known security flaws found in Otter Blocks
since May 2023

Safe from 3.2.8

Version 3.2.8 or later fixes all of them. A site on an older version is open to them.

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When they were found.

Major: Running code, May 2023Minor: Cross-site scripting, March 2024Minor: Cross-site scripting, March 2024Minor: Cross-site scripting, March 2024Minor: Cross-site scripting, April 2024Minor: Cross-site scripting, April 2024Minor: Cross-site scripting, April 2024Minor: Cross-site scripting, October 2024Advisory: Missing checks, November 2024Minor: Reading files, November 2024Major: Information leak, August 2025Major: Missing checks, April 2026Minor: Missing checks, April 2026Advisory: Information leak, September 2026Advisory: Open redirect, October 2026Advisory: Cross-site scripting, October 2026Minor: Information leak, October 2026Advisory: Information leak, October 2026Advisory: Cross-site scripting, October 20262023202420252026

DangerousMajorMinorAdvisory

What they could let someone do.

What could happen

  • Information leak

    It could give away information that should stay private, such as user details, file locations or settings, which makes other attacks easier.

    How: The software shows, sends or logs more than it should.

  • 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
  • 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
Every known flaw, newest first (19)
  1. October 2026AdvisoryCross-site scriptingFixed in 3.2.8. No login needed.
  2. October 2026MinorInformation leakFixed in 3.2.8. No login needed.
  3. October 2026AdvisoryInformation leakFixed in 3.2.8.
  4. October 2026AdvisoryCross-site scriptingFixed in 3.2.8. Needs a login on the site (Contributor+).
  5. October 2026AdvisoryOpen redirectFixed in 3.2.3. No login needed.
  6. September 2026AdvisoryInformation leakFixed in 3.2.7. Needs a login on the site (Subscriber+).
  7. April 2026MajorMissing checksFixed in 3.1.5. No login needed.
  8. April 2026MinorMissing checksFixed in 3.1.8. No login needed.
  9. August 2025MajorInformation leakFixed in 3.1.1. No login needed.
  10. November 2024MinorReading filesFixed in 3.0.7. No login needed.
  11. November 2024AdvisoryMissing checksFixed in 3.0.4. Needs a login on the site.
  12. October 2024MinorCross-site scriptingFixed in 3.0.5. Needs a login on the site (Author+).
  13. April 2024MinorCross-site scriptingFixed in 2.6.10. Needs a login on the site (Contributor+).
  14. April 2024MinorCross-site scriptingFixed in 2.6.9. Needs a login on the site (Contributor+).
  15. April 2024MinorCross-site scriptingFixed in 2.6.9. Needs a login on the site (Author+).
  16. March 2024MinorCross-site scriptingFixed in 2.6.6. Needs a login on the site (Contributor+).
  17. March 2024MinorCross-site scriptingFixed in 2.6.6. No login needed.
  18. March 2024MinorCross-site scriptingFixed in 2.6.5. Needs a login on the site (Contributor+).
  19. May 2023MajorRunning codeFixed in 2.2.6. Needs a login on the site.

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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