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TI-2026-54247 Aliases CVE-2026-77939GHSA-j8rr-2wmh-q2h8

Flextype CMS 1.0.0-dev RCE via POST /api/v1/query Endpoint

Priority MEDIUM 64CWE-1336Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-1336.

Summary

Flextype CMS through v1.0.0-dev contains an expression language injection vulnerability that allows authenticated attackers with a valid API token to read arbitrary files by passing unsanitized user-supplied input to the Symfony ExpressionLanguage engine via the POST /api/v1/query endpoint. Attackers can leverage exposed application objects including filesystem() and serializers() within the evaluation scope to read arbitrary server files and achieve conditional remote code execution if a PHP file can be placed on disk through a secondary vector.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0061 49th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
flextypeflextypeup to 1.0.0-dev—No fix listedCNA
  • flextype Vendorflextype Affected up to 1.0.0-dev Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-77939
  2. 2026-10-03 Alias added: GHSA-j8rr-2wmh-q2h8

References

Exploit 1

  • TI-2026-61974 Flextype CMS through 1.0.0-alpha.3 Path Traversal via Entries REST API CVSS 4.0HIGH 7.2
  • TI-2026-60281 Flextype CMS through 1.0.0-alpha.3 API Token Exposure via Query String CVSS 4.0HIGH 8.2
  • TI-2026-60385 Flextype CMS 0.9.9 through 1.0.0-alpha.3 Stored XSS via Plugin Directory CVSS 4.0LOW 2.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences