ProSolution WP Client <= 2.0.10 - Unauthenticated Arbitrary File Upload via Content-Disposition Header Filename Override
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 ProSolution WP Client plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.0.10 via the proSol_handleFileUpload function. This is due to missing validation of the attacker-controlled Content-Disposition header filename, which overrides the allow-listed multipart filename before the file is saved, and a post-save extension check that fails to delete the already-written file. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. The nonce required to reach the upload handler is publicly exposed via wp_localize_script on any front-end page rendering the job portal shortcode, allowing unauthenticated visitors to obtain a valid nonce and bypass that gating check entirely.
Why it matters now
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 |
|---|---|---|---|---|---|
| prosolution | ProSolution WP Client | up to 2.0.10 | — | No fix listed | CNA |
- ProSolution WP Client Vendorprosolution Affected up to 2.0.10 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16098
- 2026-10-03 Alias added: GHSA-7vxm-f6w4-qrp3
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/3c4a7aef-09ec-4d17-87d6-f507d64e0afa?source=cve
- https://plugins.trac.wordpress.org/browser/prosolution-wp-client/tags/2.0.6/includes/UploadHandler.php#L1090
- https://plugins.trac.wordpress.org/browser/prosolution-wp-client/tags/2.0.6/includes/UploadHandler.php#L1327
- https://plugins.trac.wordpress.org/browser/prosolution-wp-client/tags/2.0.6/public/class-prosolwpclient-public.php#L1033
- https://plugins.trac.wordpress.org/browser/prosolution-wp-client/tags/2.0.6/includes/class-prosolwpclient.php#L254
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3644463%40prosolution-wp-client&new=3644463%40prosolution-wp-client
More prosolution vulnerabilities
- TI-2026-05745 ProSolution WP Client <= 2.0.0 - Unauthenticated Arbitrary File Upload via 'files' CVSS 3.1CRITICAL 9.8
- TI-2026-02534 ProSolution WP Client <= 1.9.9 - Unauthenticated Arbitrary File Upload via proSol_fileUploadProcess CVSS 3.1CRITICAL 9.8
- TI-2026-12259 ProSolution WP Client <= 2.0.8 - Unauthenticated Arbitrary File Deletion via 'newfilename' and 'filename' Parameters CVSS 3.1CRITICAL 9.1
Sources
- CVE-2026-16098 · CVE Program
- CVE-2026-16098 · NVD
- FIRST EPSS
- GHSA-7vxm-f6w4-qrp3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences