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SiteSkite EUVDEUVD-2026-85529

| CVE-2026-93513 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-09-23 Patchstack GHSA-26gj-h59p-xwv8
4.3
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
    Obtain Contributor account on target site
  2. Delivery
    Enumerate object IDs owned by other users
  3. Exploit
    Send request with another user's ID
  4. Execution
    Plugin skips ownership check
  5. Impact
    Modify or tamper with victim's object

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Object-level authorization, IDOR prevention
Exploitation Conditions

Requires a valid authenticated account with at least Contributor-level privileges on a WordPress site running the SiteSkite plugin version 2.1.7 or earlier (PR:L). Exploitation is network-reachable with low complexity and no user interaction, but is limited to modifying objects (integrity only, I:L) - there is no data disclosure (C:N) or denial of service (A:N). The primary limiting factor is that the attacker must already hold Contributor access, so sites that do not permit self-registration or that restrict authoring roles substantially reduce exposure.

Impact

This is a low-real-priority issue whose signals are internally consistent rather than conflicting. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N, base 4.3) describes a network-reachable but authenticated flaw requiring at least Contributor-level access, with no confidentiality or availability impact and only Low integrity impact - an attacker can act on objects belonging to other users but cannot read sensitive data or take the site down. No EPSS score, no CISA KEV listing, and no public POC were provided, so there is no evidence of exploitation interest; per the precision rules this is 'no public exploit identified at time of analysis.' There is no SSVC decision data. The requirement for a valid Contributor account materially limits the population of potential attackers to users already granted authoring access, so despite the network attack vector this is best treated as a low-severity authorization defect rather than an urgent patch. Note the input Tags label this 'Authentication Bypass,' which conflicts with the CWE-639 (IDOR/broken object-level authorization) classification and the PR:L vector - this is an authorization flaw exploitable BY an authenticated user, not an authentication bypass.

Exploit ScenarioDerived

An attacker who registers or obtains a Contributor account on a WordPress site running SiteSkite <= 2.1.7 sends requests referencing object identifiers (e.g., post, resource, or record IDs) belonging to other users, and the plugin fails to verify ownership before acting. Because CVSS shows AV:N/AC:L/PR:L with only Low integrity impact, the attacker can tamper with or modify another user's objects but cannot read confidential data or cause an outage. No public exploit code was identified at the time of analysis.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 23, 2026

Insecure direct object reference (IDOR) in the SiteSkite WordPress plugin versions up to 2.1.7 allows authenticated attackers with Contributor-level privileges to modify arbitrary objects on the site. The vulnerability is network-reachable with low attack complexity and requires no user interaction, but it only impacts data integrity (no confidentiality or availability impact). No public exploit code or active exploitation has been identified at time of analysis.

RemediationAI

No vendor-released patch is identified in the provided data; consult the Patchstack advisory for any updated version. As a compensating control, restrict the Contributor role to trusted users only, as the vulnerability requires an authenticated account with at least Contributor privileges. If the plugin is not essential, consider disabling or removing it. Site administrators should also enforce strict user registration policies to prevent untrusted users from obtaining Contributor-level access. Additionally, monitor for unauthorized modifications to posts and other objects. If a patched version becomes available, upgrade immediately.

Affected VersionsENISA

SiteSkite n/a ≤2.1.7

Affected Packages

euvd siteskite 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 vulnerability is a classic instance of CWE-639: Authorization Bypass Through User-Controlled Key, also known as an Insecure Direct Object Reference (IDOR). In the context of the SiteSkite WordPress plugin, the application likely fails to verify that a user-supplied object identifier (such as a post ID, page ID, or plugin-specific record ID) belongs to the requesting user before performing an action. WordPress uses a role-based access control system where Contributors can create and manage their own posts but should not be able to modify posts authored by others. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N confirms that exploitation is network-based (AV:N), requires low complexity (AC:L), and demands low privileges (PR:L) - specifically a Contributor-level account. There is no user interaction (UI:N) and no scope change (S:U). The impact is limited to partial integrity loss (I:L), with no confidentiality (C:N) or availability (A:N) impact. The CPE string cpe:2.3:a:siteskite:siteskite:*:*:*:*:*:*:*:* indicates the vulnerability applies to all versions of the SiteSkite plugin, but the advisory specifies version 2.1.7 and earlier as affected.

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Severity by source

Vendor (Patchstack) PRIMARY 4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
vuln.today AI 4.3 MEDIUM

Contributor-level authentication over the network gives PR:L/AV:N/AC:L; CWE-639 IDOR permits tampering with others' objects (I:L) with no read or availability impact (C:N/A:N).

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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
Low
Availability
None

DescriptionCVE.org

Contributor Insecure Direct Object References (IDOR) in SiteSkite <= 2.1.7 versions.

Threat Intelligence Overview

EPSS Score
0.2%
Top 93% exploitable
Prevalence
Low
niche WordPress plugin, small installed base, obscure vendor siteskite
Data Quality
4 sources
Confidence: Medium

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 0.2%
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

22
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +22
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

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