# CVE-2026-13504 — code-projects Project Management System

> As of 2026-06-28, CVE-2026-13504 is a LOW-severity vulnerability in code-projects Project Management System, CVSS v3.1 3.5, EPSS 0.2% (10.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-13504 as of 2026-06-28; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-06-28

## What is CVE-2026-13504?

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.

The record classifies CVE-2026-13504 under weakness classes [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79), [CWE-94](https://intel.threadlinqs.com/cwe/CWE-94). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 99 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 3.5 — LOW (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 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`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 10.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-28

## Is CVE-2026-13504 being exploited?

It currently carries a trending score of 32 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [code-projects](https://intel.threadlinqs.com/vendors/code-projects): Project Management System

## How to fix CVE-2026-13504

No vendor patch reference has been recorded for CVE-2026-13504 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-13504

No threat campaign in the Threadlinqs corpus currently references CVE-2026-13504, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-06-30.

**Exploit and proof of concept**

- [github.com — exploit](https://github.com/MyMySSS/CVE123/blob/main/cve4/PMS_CVE_Submission.md)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/374499/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-13504)
- [vuldb.com — third party advisory (838683)](https://vuldb.com/submit/838683)

**Vulnerability database entry**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/374499)

**Issue tracking and product pages**

- [code-projects.org — product](https://code-projects.org/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-13504
Full detection coverage and IOCs for threats exploiting CVE-2026-13504 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp