Dashboard / CVE-2026-84999

CVE-2026-84999

CRITICAL
INFO Priority: 0.05 BB Relevance: 80/100
Published: 2026-10-28 Modified: 2026-10-29 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: High
I: High
A: High

Description

The Pie Register Premium plugin for WordPress is vulnerable to Unrestricted File Type Upload in all versions up to, and including, 3.8.4.0 via the piereg_file_upload function. This is due to the plugin performing file type validation via wp_check_filetype and wp_check_filetype_and_ext but never checking whether those validation calls produced errors before move_uploaded_file() is called, combined with no nonce or capability check on the AJAX handler. This makes it possible for unauthenticated attackers to upload files of dangerous types (e.g. PHP scripts) that may be executable, which makes remote code execution possible. The server returns the generated destination filename in the response, giving the attacker the exact path needed to trigger the uploaded file.

Weakness Classification (1)

Affected Software (4)

VendorProductVersion
Pie Register Pie Register Premium 0
Pie Register Pie Register Premium 0
Pie Register Pie Register Premium 0
Pie Register Pie Register Premium 0

References & Advisories (2)

Bug Bounty Relevance

80 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.8 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploitation Probability

0.48%
Raw Score 0.004830
Percentile 41.6%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00483
2026-10-28
0.00483

Intelligence Sources

mitre ref →
nvd ref →

External Links