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WordPress Task Scheduler CVE-2025-10056

MEDIUM
Server-Side Request Forgery (SSRF) (CWE-918)
2025-10-15 security@wordfence.com
4.4
CVSS 3.1 · Vendor: wordfence
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Attack ChainAIDerived

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

  1. Access
    Obtain WordPress Administrator access
  2. Exploit
    Configure 'Check Website' task with internal URL
  3. Execution
    Plugin issues server-side request
  4. Impact
    Query/modify internal services

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V4 - API and Web Service URL allowlisting, SSRF prevention
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Credential Access

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

Exploitation Conditions

Requires an authenticated session with Administrator-level privileges (or higher) on the target WordPress site, consistent with PR:H in the CVSS vector. The specific vulnerable feature is the plugin's 'Check Website' task, which must be used to supply an attacker-chosen URL/host; the SSRF only yields value when the WordPress server has network paths to internal services (metadata endpoints, internal APIs, databases) that are not externally reachable. The admin requirement is the primary limiting factor and makes widespread opportunistic exploitation unlikely; affects all versions up to and including 1.6.3.

Impact

This is a low-priority issue despite being network-reachable. The CVSS 3.1 vector (AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N, base 4.4 MEDIUM) hinges on PR:H - exploitation requires existing Administrator-level access to the WordPress site, which is the single strongest mitigating signal: an attacker who already holds admin can typically pivot through many other avenues (plugin/theme file editing, PHP execution), so the marginal risk added by this SSRF is limited. Exploitation signals are weak and mutually consistent: EPSS is 0.24% (14th percentile), there is no CISA KEV listing, and no public proof-of-concept is referenced - so no public exploit identified at time of analysis. One internal inconsistency worth noting: the input vector sets AC:H, but the description portrays a straightforward abuse of the 'Check Website' task feature with no special timing/race conditions, so AC:L is arguably more accurate - this disagreement does not change the overall LOW real-world priority given the admin precondition. The scope change (S:C) and CWE-918 correctly reflect that impact lands on internal/back-end services rather than the WordPress app itself.

Exploit ScenarioDerived

An attacker who has already obtained Administrator access to a WordPress site (e.g., via compromised credentials or a rogue admin account) configures the Task Scheduler 'Check Website' task to point at an internal address such as a cloud metadata endpoint or an internal admin API. The plugin issues the request from the server, allowing the attacker to query and modify internal services not otherwise reachable from the internet. No public exploit identified at time of analysis, so this would require manual abuse of the feature.

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 – Oct 08, 2026

Server-side request forgery in the WordPress Task Scheduler plugin (all versions up to and including 1.6.3) allows an authenticated Administrator-level user to make the WordPress server send arbitrary HTTP requests through the plugin's 'Check Website' task, potentially querying or modifying internal services that are not externally reachable. This is a low-priority issue despite being network-reachable: successful exploitation requires high privileges (PR:H), the value depends on reachable internal network targets, EPSS is 0.24% (14th percentile), and no public exploit identified at time of analysis.

RemediationAI

The provided data does not identify an exact fixed version or vendor-released patch, so verify the plugin page at https://wordpress.org/plugins/task-scheduler/ for a release later than 1.6.3 and update when a fixed version is available, and monitor https://www.wordfence.com/threat-intel/vulnerabilities/id/d5211437-9c6d-435f-a7f2-17ed754d0fab?source=cve for vendor guidance. If immediate patching is not possible, disable or uninstall the Task Scheduler plugin if its scheduling features are not required, or restrict use of the 'Check Website' task to fully trusted administrators; these reduce exposure but remove or limit intended functionality. As compensating controls, enforce egress filtering from the WordPress host to deny outbound requests to RFC1918 ranges, localhost, and cloud metadata IPs such as 169.254.169.254 while allowing only required external destinations; this can break legitimate scheduled checks or other plugins that rely on outbound HTTP. Because exploitation requires Administrator-level access, tightening administrator account ownership, using least-privilege roles, and enabling audit logging of plugin task creation can also reduce risk but do not fix the underlying SSRF.

Affected ProductsAI

The affected product is the WordPress Task Scheduler plugin, versions up to and including 1.6.3, distributed through the WordPress.org plugin directory. No CPE strings were supplied in the intelligence data, so the authoritative package identifier from the references is the plugin slug task-scheduler at https://wordpress.org/plugins/task-scheduler/. The Wordfence vulnerability entry is https://www.wordfence.com/threat-intel/vulnerabilities/id/d5211437-9c6d-435f-a7f2-17ed754d0fab?source=cve. Any WordPress installation running this plugin at or below 1.6.3 is in scope, though exploitation requires Administrator-level authentication.

Affects your stack

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

Technical ContextAI · show details

CWE-918 (Server-Side Request Forgery) arises because the Task Scheduler plugin's 'Check Website' task accepts a user-supplied URL and performs an outbound HTTP request from the WordPress host without adequately validating or restricting the destination. The plugin is a WordPress.org-distributed scheduler; no CPE strings are included in the supplied data, but the affected package is the task-scheduler plugin at versions up to and including 1.6.3. The feature is intended to test whether a site or endpoint is reachable, but an Administrator can redirect it to internal-only addresses such as cloud metadata endpoints, internal APIs, localhost, or RFC1918 ranges; the CVSS scope-change (S:C) reflects that the web application can affect components beyond its own security authority. Our assessed vector is CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N with PR:H, so the attacker must already hold Administrator-level access and impact is limited to low confidentiality and integrity.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (wordfence) PRIMARY 4.4 MEDIUM
AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
vuln.today AI 5.5 MEDIUM

Admin-only feature so PR:H; abusing the Check Website task is straightforward so AC:L; SSRF reaches internal services (S:C) allowing limited read/modify (C:L/I:L), no availability impact.

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

Primary rating from Vendor (wordfence).

CVSS VectorVendor: wordfence

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

DescriptionCVE.org

The Task Scheduler plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 1.6.3 via the “Check Website” task. This makes it possible for authenticated attackers, with Administrator-level access and above, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.

Threat Intelligence Overview

EPSS Score
0.2%
Top 86% exploitable
Prevalence
Low
niche WordPress scheduling plugin, modest install base
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 0.2%
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· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

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

Attack Technique

Server-Side Request Forgery exploits applications that fetch remote resources based on user-supplied URLs.

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