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WP User Frontend CVE-2026-95523

| EUVDEUVD-2026-85492 MEDIUM
Authentication Bypass by Spoofing (CWE-290)
2026-09-23 Patchstack GHSA-m3rq-gjfx-fm33
6.5
CVSS 3.1 · Vendor: Patchstack
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Register or obtain Subscriber account
  2. Delivery
    Authenticate to WordPress site
  3. Exploit
    Invoke plugin action lacking proper role check
  4. Execution
    Spoof authorization (CWE-290)
  5. Impact
    Modify data reserved for higher privilege

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Anti-spoofing controls
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Requires the attacker to hold a valid low-privilege authenticated account (Subscriber level, PR:L) on a WordPress site running WP User Frontend <= 4.3.11; this is realistic because the plugin is a front-end user/registration tool where open self-registration is frequently enabled. Exploitation is remote (AV:N) with low complexity (AC:L) and no user interaction (UI:N), but is limited by the need for an account and by the plugin being installed and the affected feature reachable. The specific feature/endpoint that performs the insufficient identity check is not named in the supplied description and should be confirmed against the Patchstack advisory.

Impact

This is a genuine but moderate-priority issue, not an inflated high-CVSS finding. The vendor (Patchstack) CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N scores 6.5, driven entirely by a High integrity impact (C:N/A:N) reachable by a low-privileged authenticated user (PR:L) over the network with no user interaction. CWE-290 (Authentication Bypass by Spoofing) plus the 'Subscriber Bypass' title indicates a Subscriber-level account can bypass an access/authorization control the plugin relies on, gaining write/modify capability it should not have. No EPSS score, no CISA KEV listing, and no public POC are present in the supplied intelligence, so there is no evidence of active exploitation or automated weaponization - this argues against emergency prioritization. The main tension is I:H with C:N/A:N: the terse description does not name the exact endpoint or what integrity-affecting action becomes possible, so the High integrity rating cannot be independently corroborated and should be verified against the Patchstack advisory. Overall: real, network-reachable, but gated behind holding a valid (even if low-tier) plugin account, and lacking exploitation signals - routine patch priority.

Exploit ScenarioDerived

An attacker registers or obtains a Subscriber-level account on a WordPress site running WP User Frontend <= 4.3.11 (self-registration is common on sites using this plugin). They then invoke a plugin action that fails to properly verify the caller's role/identity, spoofing authorization to perform an operation reserved for higher-privileged users and altering data or content. No public exploit code is identified at time of analysis, and no user interaction is required beyond the attacker's own authenticated session.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 23, 2026

WP User Frontend versions up to and including 4.3.11 contain an authentication bypass by spoofing that allows an authenticated Subscriber-level user to exceed their intended authorization and modify protected data (CVSS 6.5, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N). Exploitation is remote, low-complexity, and requires no user interaction, but the attacker must first hold a valid low-privilege account; this is realistic on WordPress sites that enable open self-registration for the plugin. No public exploit identified at time of analysis and no CISA KEV active exploitation is reported in the supplied data, and the exact vulnerable endpoint should be confirmed against the Patchstack advisory.

RemediationAI

No exact vendor-released fix version is included in the supplied data, so a patched release beyond 4.3.11 is not independently confirmed; consult the Patchstack advisory at the reference URL for the current fixed version and apply it as soon as the vendor publishes one. If the plugin is not essential, disabling WP User Frontend removes the vulnerable attack surface, though it also removes all front-end user registration, profile, and posting features. If the plugin must remain active, disable open self-registration or require administrator approval so an attacker cannot self-provision the Subscriber account needed to exploit the bypass; the trade-off is reduced registration volume and additional administrative overhead. Additional compensating controls include applying targeted WAF or virtual-patching rules that block subscriber-level requests attempting to change roles, identities, or protected content through the plugin (with possible false positives requiring tuning), reviewing and tightening Subscriber role capabilities to remove any plugin-granted privileges not required for legitimate use (which may disrupt legitimate subscriber workflows), and monitoring WordPress audit logs for Subscriber accounts modifying data outside their normal permissions. Confirm the exact vulnerable endpoint in the Patchstack advisory before restricting specific plugin routes, and do not assume that version 4.3.11 is fixed until the advisory states otherwise.

Affected VersionsENISA

WP User Frontend n/a ≤4.3.11

Affected Packages

euvd wp_user_frontend no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The affected component is the WordPress plugin WP User Frontend from WeDevs, identified by CPE cpe:2.3:a:wedevs:wp_user_frontend:*:*:*:*:*:*:*:* and EUVD-2026-85492, with reported affected versions 4.3.11 and earlier. CWE-290 (Authentication Bypass by Spoofing) points to a logic flaw in which the plugin trusts an identity, role, or authorization signal without adequately verifying it; in WordPress plugin terms, this is consistent with a Subscriber-level account being able to spoof a higher-privileged context or bypass a capability check on a front-end action. The CVSS vector AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N confirms remote reachability with low attack complexity and a valid low-privilege account, resulting in high integrity impact but no confidentiality or availability impact. The input data does not name the specific feature or endpoint that performs the insufficient identity check, so the root-cause path remains to be verified in the Patchstack advisory.

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Severity by source

Vendor (Patchstack) PRIMARY 6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
vuln.today AI 6.5 MEDIUM

Network-reachable action abusable by an authenticated Subscriber (PR:L, AC:L, UI:N); CWE-290 bypass yields integrity impact only (I:H) with no confidentiality or availability effect.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

DescriptionCVE.org

Subscriber Bypass Vulnerability in WP User Frontend <= 4.3.11 versions.

Threat Intelligence Overview

EPSS Score
0.3%
Top 76% exploitable
Prevalence
Medium
weDevs WP User Frontend is a widely-installed WordPress user/registration plugin
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.3%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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