CVE-2026-1555: CWE-434 Unrestricted Upload of File with Dangerous Type in Owen WebStack
The Owen WebStack WordPress theme contains a critical vulnerability (CVE-2026-1555) due to missing file type validation in the io_img_upload() function. This flaw allows unauthenticated attackers to upload arbitrary files to the affected server, potentially enabling remote code execution. The vulnerability affects all versions up to and including 1. 2024. No official patch or remediation guidance has been provided yet. The CVSS score is 9. 8, indicating a critical severity level.
AI Analysis
Technical Summary
CVE-2026-1555 is a critical vulnerability in the Owen WebStack WordPress theme caused by unrestricted file upload due to lack of file type validation in the io_img_upload() function. This allows unauthenticated attackers to upload arbitrary files, which may lead to remote code execution on the server hosting the affected theme. The vulnerability affects all versions up to 1.2024. There is no vendor advisory or patch currently available, and the vulnerability is not related to a cloud service. The CVSS 3.1 base score is 9.8, reflecting network attack vector, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
An attacker can upload arbitrary files without authentication, which may lead to remote code execution on the affected server. This compromises the confidentiality, integrity, and availability of the system running the vulnerable WebStack theme. Given the critical CVSS score of 9.8, successful exploitation could result in full system compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, it is recommended to disable or restrict the vulnerable file upload functionality if possible, and monitor for suspicious file uploads. Avoid exposing the vulnerable theme on public-facing sites or restrict access to trusted users only.
CVE-2026-1555: CWE-434 Unrestricted Upload of File with Dangerous Type in Owen WebStack
Description
The Owen WebStack WordPress theme contains a critical vulnerability (CVE-2026-1555) due to missing file type validation in the io_img_upload() function. This flaw allows unauthenticated attackers to upload arbitrary files to the affected server, potentially enabling remote code execution. The vulnerability affects all versions up to and including 1. 2024. No official patch or remediation guidance has been provided yet. The CVSS score is 9. 8, indicating a critical severity level.
CVSS v3.1
Score 9.8critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-1555 is a critical vulnerability in the Owen WebStack WordPress theme caused by unrestricted file upload due to lack of file type validation in the io_img_upload() function. This allows unauthenticated attackers to upload arbitrary files, which may lead to remote code execution on the server hosting the affected theme. The vulnerability affects all versions up to 1.2024. There is no vendor advisory or patch currently available, and the vulnerability is not related to a cloud service. The CVSS 3.1 base score is 9.8, reflecting network attack vector, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
An attacker can upload arbitrary files without authentication, which may lead to remote code execution on the affected server. This compromises the confidentiality, integrity, and availability of the system running the vulnerable WebStack theme. Given the critical CVSS score of 9.8, successful exploitation could result in full system compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, it is recommended to disable or restrict the vulnerable file upload functionality if possible, and monitor for suspicious file uploads. Avoid exposing the vulnerable theme on public-facing sites or restrict access to trusted users only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-01-28T17:18:24.254Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69df0daf82d89c981f2a19ce
Added to database: 4/15/2026, 4:01:51 AM
Last enriched: 4/22/2026, 6:44:36 AM
Last updated: 5/30/2026, 5:51:13 PM
Views: 258
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.