# CVE-2026-13504: code-projects Project Management System Mail Compose mail.php cross site scripting

> Remote attackers can execute arbitrary scripts via the Mail Compose page in code-projects Project Management System, potentially compromising user sessions.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 28 Jun 2026
- **Updated:** 30 Jun 2026
- **Also known as:** GHSA-7252-h5v6-wx9v

## What is CVE-2026-13504?

CVE-2026-13504 is a medium-severity cross-site scripting vulnerability in code-projects Project Management System, published on 28 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A vulnerability has been found in code-projects Project Management System 1.0. This vulnerability affects unknown code of the file /mail.php of the component Mail Compose Page. Such manipulation leads to cross site scripting. The attack may be performed from remote. The exploit has been disclosed to the public and may be used.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-13504?


## How do I fix CVE-2026-13504?

No fix has been published for CVE-2026-13504 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13504 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13504 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13504 and fix it if it is affected.

What it is: CVE-2026-13504 is a medium-severity cross-site scripting vulnerability in code-projects Project Management System, published on 28 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13504 exists.

Affected product: code-projects Project Management System. 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-2026-13504/ (Markdown: https://insights.sbomify.com/CVE-2026-13504/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13504
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13504
- OSV: https://osv.dev/vulnerability/CVE-2026-13504

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-13504/
Summaries are generated and may contain mistakes; the official description above is the record.