Critical-Severity Unrestricted File Upload Flaw in WP Mailster Tracked as CVE-2026-111832
A newly published critical vulnerability in WP Mailster carries a CVSS score of 10. Here is what is affected and how to respond.
Key points
- CVE-2026-111832 affects WP Mailster.
- CVSS 10 (Critical).
- No exploitation confirmed yet.
WP Mailster is affected by CVE-2026-111832, a unrestricted file upload that the National Vulnerability Database rates 10 out of 10.
At a glance
- CVE
- CVE-2026-111832
- Product
- WP Mailster
- CVSS
- 10 Critical
- Weakness
- unrestricted file upload
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: Unrestricted Upload of File with Dangerous Type vulnerability in WP Mailster WP Mailster wp-mailster allows Upload a Web Shell to a Web Server.This issue affects WP Mailster: from n/a through 1.9.1.0.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Wp Mailster | WP Mailster | up to 1.9.1.0 |
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-111832
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-111832?
CVE-2026-111832 is a unrestricted file upload vulnerability in WP Mailster.
How severe is CVE-2026-111832?
It has a CVSS score of 10 Critical.
Is CVE-2026-111832 being exploited?
There is no public confirmation of exploitation at the time of publication.
