CVE-2026-27064
WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
WordPress Mailster plugin <= 4.1.17 - Arbitrary File Upload vulnerability
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
- Record
CVE-2026-27064- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
EUVDEUVD-2026-48151
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
- Record
EUVD-2026-48151- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-qwf2-rfq8-mpjg
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
- Record
GHSA-qwf2-rfq8-mpjg- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
NVD
Editor Arbitrary File Upload in Mailster <= 4.1.17 versions.
- Record
CVE-2026-27064- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-27064 is a critical vulnerability (CVSS 9.1) in Everpress Mailster, published July 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.50%, the 42nd percentile. No source names a fixed version.