What is CVE-2026-27933?

CVE-2026-27933 is a medium-severity vulnerability in Manyfold, classified under Insufficient Session Expiration. CVSS score: 6.8/10. Published 2026-02-26.

How severe is CVE-2026-27933?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Manyfold

CVE-2026-27933

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.

Published 2026-02-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (28.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Manyfold
Manyfold3d Manyfold — versions < 0.133.0

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

github.com/manyfold3d/manyfold/security/advisories/GHSA-g949-hmvj-2r76 (Exploit, Vendor Advisory)
github.com/manyfold3d/manyfold/releases/tag/v0.133.0 (Product, Release Notes)

Frequently asked questions

What is CVE-2026-27933?: CVE-2026-27933 is a medium-severity vulnerability in Manyfold, classified under Insufficient Session Expiration. CVSS score: 6.8/10. Published 2026-02-26.
How severe is CVE-2026-27933?: Medium severity. CVSS v3 base score is 6.8 out of 10.