TI-2026-01244 Aliases CVE-2026-1555 GHSA-5c49-p8m3-fjh3

WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

MEDIUM 51CWE-434Published 2026-04-15 · Updated 2026-04-15

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-434.

Summary

The WebStack theme for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the io_img_upload() function in all versions up to, and including, 1.2024. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00984 62nd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Owen	WebStack	up to 1.2024	—	No fix listed	CNA

WebStack VendorOwen Affected up to 1.2024 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-1555
2026-10-03 Alias added: GHSA-5c49-p8m3-fjh3

References

Other 3

Sources

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