User Submitted Posts <= 20230902 — Unauthenticated Arbitrary File Upload
CVE-2023-45603Published · Updated Action summary
Affected: ≤20230902Update to 20230914 or newer
All remediation steps- Severity
- Critical9.8
- CVSS
- 9.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-434 Arbitrary File Upload
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
User Submitted Posts – Enable Users to Submit Posts from the Front End user-submitted-posts
- Affected≤ 20230902
- Patched in20230914
Update to 20230914 or newer.
You are affected if you run ≤ 20230902. Version 20230914 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under User Submitted Posts – Enable Users to Submit Posts from the Front End.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 20230914, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch User Submitted Posts – Enable Users to Submit Posts from the Front End to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Rafie Muhammad.
The User Submitted Posts plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the usp_attach_images function in versions up to, and including, 20230902. This makes it possible for unauthenticatedattackers to upload arbitrary files as long as the extension does not contain 'php' on the affected site's server which may make remote code execution possible.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in User Submitted Posts – Enable Users to Submit Posts from the Front End
All 15| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored DOM-Based Cross-Site Scripting via 'user-submitted-content' Parameter via Block-Comment Shortcode Splitting ≤20260916Update to 20261029 | CVE-2026-119162 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤20260810Update to 20260916 | CVE-2026-62084 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤20260607Update to 20260608 | CVE-2026-11570 | |
| Medium5.3 | Incorrect Authorization to Unauthenticated Category Restriction Bypass via 'user-submitted-category' Parameter ≤20260113Update to 20260217 | CVE-2026-2126 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Custom Field ≤20251210Update to 20260110 | CVE-2026-0800 |
- High7.2Unauthenticated Stored DOM-Based Cross-Site Scripting via 'user-submitted-content' Parameter via Block-Comment Shortcode Splitting
≤20260916Update to 20261029
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤20260810Update to 20260916
- High7.2Unauthenticated Stored Cross-Site Scripting
≤20260607Update to 20260608
- Medium5.3Incorrect Authorization to Unauthenticated Category Restriction Bypass via 'user-submitted-category' Parameter
≤20260113Update to 20260217
- High7.2Unauthenticated Stored Cross-Site Scripting via Custom Field
≤20251210Update to 20260110
Same weakness (Arbitrary File Upload)
All Arbitrary File Upload| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity critical, CVSS 9.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.