# CVE-2026-39344: Reflected XSS the login page through the 'username' parameter

> Attackers can execute malicious scripts via the username parameter on the login page, potentially stealing session cookies or hijacking user accounts.

- **Severity:** High 8.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 7 Apr 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-rx8c-j7x8-w3hj

## What is CVE-2026-39344?

CVE-2026-39344 is a high-severity cross-site scripting vulnerability in Churchcrm Churchcrm, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

ChurchCRM is an open-source church management system. Prior to 7.1.0, there is a Reflected Cross-Site Scripting (XSS) vulnerability on the login page, which is caused by the lack of sanitization or encoding of the username parameter received from the URL. The username parameter value is directly displayed in the login page input element without filter, allowing attackers to insert malicious JavaScript scripts. If successful, script can be executed on the client side, potentially stealing sensitive data such as session cookies or replacing the display to show the attacker's login form. This vulnerability is fixed in 7.1.0.

Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-39344?

It affects 1 product.


Products: Churchcrm Churchcrm.

## How do I fix CVE-2026-39344?

No fix has been published for CVE-2026-39344 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-39344 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39344 exists.

## Other vulnerabilities in Churchcrm Churchcrm

- [CVE-2026-39337](https://insights.sbomify.com/CVE-2026-39337/): ChurchCRM Affected by Unauthenticated RCE in Install Wizard (critical 10.0)
- [CVE-2025-62521](https://insights.sbomify.com/CVE-2025-62521/): ChurchCRM has unauthenticated RCE in its Install Wizard (critical 10.0)
- [CVE-2025-68110](https://insights.sbomify.com/CVE-2025-68110/): ChurchCRM discloses database information on error message (critical 10.0)
- [CVE-2024-53438](https://insights.sbomify.com/CVE-2024-53438/): SQL injection in n/a (critical 9.8)
- [CVE-2024-25894](https://insights.sbomify.com/CVE-2024-25894/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-39344 and fix it if it is affected.

What it is: CVE-2026-39344 is a high-severity cross-site scripting vulnerability in Churchcrm Churchcrm, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, 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-2026-39344 exists.

Affected product: Churchcrm Churchcrm. 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-2026-39344/ (Markdown: https://insights.sbomify.com/CVE-2026-39344/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-39344
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39344
- OSV: https://osv.dev/vulnerability/CVE-2026-39344

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-39344/
Summaries are generated and may contain mistakes; the official description above is the record.