ImproveSEO <= 2.0.11 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution
Published Aug 4, 2026
9.8
CRITICALCVSS 3.1
EPSS 0.83%
Description
The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files, checking only the file content type while writing the file with the attacker-supplied extension into a publicly accessible directory, allowing unauthenticated users to upload executable PHP files and achieve remote code execution.
Affected products
- Vendor n/a Product Improve SEO Defaultn/a
- Version 0StatusaffectedConstraints<=2.0.11
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Improve SEO | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Aug 4, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Aug–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.83% (0.00831) | 56.06th | v5 (v2026.06.15) |
| Aug 4, 2026 | 0.20% (0.00203) | 10.41th | v5 (v2026.06.15) |
References (1)
- https://wpscan.com/vulnerability/3754d4c0-1b67-49a4-a29a-7169446638d1/ exploitvdb-entrytechnical-description
| Link | Providers | Tags |
|---|---|---|
| https://wpscan.com/vulnerability/3754d4c0-1b67-49a4-a29a-7169446638d1/ | exploitvdb-entrytechnical-description |
Change history (0)
No recorded changes yet.