# CVE-2026-26984: LORIS media module vulnerable to remote code execution

> Authenticated users can exploit path traversal to upload malicious files, leading to remote code execution on the LORIS server.

- **Severity:** High 8.7 (`CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Feb 2026
- **Updated:** 25 Feb 2026
- **Also known as:** GHSA-mpgc-c48m-6v2h

## What is CVE-2026-26984?

CVE-2026-26984 is a high-severity vulnerability in aces Loris, published on 25 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. Prior to versions 26.0.5, 27.0.2, and 28.0.0, an authenticated user with sufficient privileges can exploit a path traversal vulnerability to upload a malicious file to an arbitrary location on the server. Once uploaded, the file can be used to achieve remote code execution (RCE). An attacker must be authenticated and have the appropriate permissions to exploit this issue. If the server is configured as read-only, remote code execution (RCE) is not possible; however, the malicious file upload may still be achievable. This problem is fixed in LORIS v26.0.5 and above, v27.0.2 and above, and v28.0.0 and above. As a workaround, LORIS administrators can disable the media module if it is not being used.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-26984?

It affects 1 product.


Products: Mcgill Loris.

## How do I fix CVE-2026-26984?

No fix has been published for CVE-2026-26984 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-26984 being exploited?

There is no known exploitation of CVE-2026-26984 in the wild and no public exploit code.

## Other vulnerabilities in aces Loris

- [CVE-2026-35169](https://insights.sbomify.com/CVE-2026-35169/): LORIS has potential cross-site scripting in help_editor module (high 8.7)
- [CVE-2026-26985](https://insights.sbomify.com/CVE-2026-26985/): LORIS vulnerable to path traversal in electrophysiology_browser (high 8.1)
- [CVE-2026-35446](https://insights.sbomify.com/CVE-2026-35446/): LORIS has a path traversal in FilesDownloadHandler (high 7.7)
- [CVE-2026-33350](https://insights.sbomify.com/CVE-2026-33350/): LORIS has a SQL injection in MRI feedback popup (high 7.5)
- [CVE-2026-34392](https://insights.sbomify.com/CVE-2026-34392/): LORIS has a path traversal in static router (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-26984 and fix it if it is affected.

What it is: CVE-2026-26984 is a high-severity vulnerability in aces Loris, published on 25 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-26984 in the wild and no public exploit code.

Affected product: aces Loris. 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-2026-26984/ (Markdown: https://insights.sbomify.com/CVE-2026-26984/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-26984
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-26984
- OSV: https://osv.dev/vulnerability/CVE-2026-26984

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-26984/
Summaries are generated and may contain mistakes; the official description above is the record.