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

> Authenticated subscribers can bypass authorization to create comments on private projects and inject HTML/CSS in the Taskbuilder WordPress plugin.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Feb 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-wxhm-86c2-x66c

## What is CVE-2026-1640?

CVE-2026-1640 is a medium-severity missing authorization vulnerability in Taskbuilder – Project Management & Task Management Tool With Kanban Board, published on 18 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-1640?


## How do I fix CVE-2026-1640?

No fix has been published for CVE-2026-1640 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1640 being exploited?

There is no known exploitation of CVE-2026-1640 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1640 and fix it if it is affected.

What it is: CVE-2026-1640 is a medium-severity missing authorization vulnerability in Taskbuilder – Project Management & Task Management Tool With Kanban Board, published on 18 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-1640 in the wild and no public exploit code.

Affected product: Taskbuilder – Project Management & Task Management Tool With Kanban Board. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-1640/ (Markdown: https://insights.sbomify.com/CVE-2026-1640/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1640
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1640
- OSV: https://osv.dev/vulnerability/CVE-2026-1640

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-1640/
Summaries are generated and may contain mistakes; the official description above is the record.