# CVE-2026-27933: Manyfold vulnerable to session hijack via cookie leakage in proxy caches

> Attackers can hijack user sessions by exploiting cookie leakage in proxy caches, requiring specific proxy configurations to be vulnerable.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/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:** 25 Feb 2026
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-g949-hmvj-2r76

## What is CVE-2026-27933?

CVE-2026-27933 is a medium-severity vulnerability in manyfold3d manyfold, published on 25 Feb 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

Manyfold is an open source, self-hosted web application for managing a collection of 3d models, particularly focused on 3d printing. Versions prior to 0.133.0 are vulnerable to session hijack via cookie leakage in proxy caches. Version 0.133.0 fixes the issue.

Weakness: CWE-613 (DEPRECATED: Insufficient Session Expiration)

## Which versions are affected by CVE-2026-27933?

It affects 1 product.


Products: Manyfold Manyfold.

## How do I fix CVE-2026-27933?

No fix has been published for CVE-2026-27933 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27933 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27933 exists.

## Other vulnerabilities in manyfold3d manyfold

- [CVE-2026-27635](https://insights.sbomify.com/CVE-2026-27635/): Manyfold vulnerable to OS command injection via ZIP filename in f3d render (high 7.5)
- [CVE-2026-28225](https://insights.sbomify.com/CVE-2026-28225/): Manyfold has IDOR in ModelFilesController (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27933 and fix it if it is affected.

What it is: CVE-2026-27933 is a medium-severity vulnerability in manyfold3d manyfold, published on 25 Feb 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-2026-27933 exists.

Affected product: manyfold3d manyfold. 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-2026-27933/ (Markdown: https://insights.sbomify.com/CVE-2026-27933/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27933
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27933
- OSV: https://osv.dev/vulnerability/CVE-2026-27933

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27933/
Summaries are generated and may contain mistakes; the official description above is the record.