# CVE-2026-104003: Code injection in Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress

> Authenticated attackers can inject arbitrary shortcodes via comments, leading to server-side code execution and data exposure on user profile pages.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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:** 16 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-6c6h-gv8v-jjr7

## What is CVE-2026-104003?

CVE-2026-104003 is a medium-severity code injection vulnerability in properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress, published on 16 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The WP User Avatar / ProfilePress plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 4.17.5. This is due to the get_user_profile_structure() function assembling the front-end profile buffer — which includes raw comment excerpts inlined by author_comment_query() — and passing the entire buffer to do_shortcode() after only a narrow neutralization pass (ppress_neutralize_buffer_shortcodes) that blocks pp-custom-html and bracket fragments containing HTML delimiters but leaves any other well-formed shortcode intact. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary shortcodes (from any active plugin or theme) with attacker-chosen attributes by posting a comment whose body contains the shortcode markup; the shortcode is then executed server-side when any visitor loads the target's front-end profile Comments tab, letting the attacker reach capability-gated or data-returning shortcodes and inject raw HTML markup into a publicly viewable page.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-104003?


## How do I fix CVE-2026-104003?

No fix has been published for CVE-2026-104003 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104003 being exploited?

There is no known exploitation of CVE-2026-104003 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104003 and fix it if it is affected.

What it is: CVE-2026-104003 is a medium-severity code injection vulnerability in properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress, published on 16 Oct 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-2026-104003 in the wild and no public exploit code.

Affected product: properfraction Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress. 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-2026-104003/ (Markdown: https://insights.sbomify.com/CVE-2026-104003/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104003
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104003
- OSV: https://osv.dev/vulnerability/CVE-2026-104003

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-104003/
Summaries are generated and may contain mistakes; the official description above is the record.