What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-16
• Weakness: CWE-22

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.

Affected products

• flextype: through 1.0.0-alpha.3

References

• 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://github.com/flextype/flextype/issues/596
• https://www.vulncheck.com/advisories/flextype-cms-through-1.0.0-alpha.3-path-traversal-via-entries-rest-api
• https://github.com/flextype/flextype/issues/596

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