Path Traversal in Flextype
CVE-2026-91751
Flextype CMS through 1.0.0-alpha.3 fails to properly validate id and new_id parameters in the Entries REST API, allowing API token holders to read, create, or overwrite files outside the entries directory. Attackers can use traversal sequences in API requests to escape the project entries directory and manipulate arbitrary files and directories on the filesystem.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (45.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- GitHub Issue #596 (issue-tracking)
- github.com/flextype/flextype (product)
- github.com/flextype/flextype/blob/v1.0.0-alpha.3/src/flextype/core/Entries/Entr… (technical-description)
- VulnCheck Advisory: Flextype CMS through 1.0.0-alpha.3 Path Traversal via Entries REST API (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91751?
- CVE-2026-91751 is a high-severity vulnerability in Flextype, classified under Path Traversal. CVSS score: 8.3/10. Published 2026-09-15.
- How severe is CVE-2026-91751?
- High severity. CVSS v3 base score is 8.3 out of 10.