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CVE-2026-1555

WebStack <= 1.2024 - Unauthenticated Arbitrary File Upload

Published: Apr 15, 2026Updated: Apr 15, 2026 Sources: CVE List
NVD MITRE
9.8CVSS
CRITICAL

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.

EPSS Score
0.1%
Top 70.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High

Weaknesses

CWE-434CWE-434 Unrestricted Upload of File with Dangerous Type

Affected Products

WebStack
Owen

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

3 techniques
Command and Control
Initial Access
Persistence
View detailed technique mapping

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/b97805de-1b47-4c9f-baae-2e37c1b78570?source=cve
wordfence.com
https://github.com/owen0o0/WebStack/blob/master/inc/ajax.php#L5
github.com
https://github.com/owen0o0/WebStack/tree/master
github.com

Timeline

Published
Apr 15, 2026
Last Updated
Apr 15, 2026

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