What is the CVSS score of CVE-2026-4338?

CVE-2026-4338 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of WordPress are affected by CVE-2026-4338?

The ActivityPub WordPress plugin before version 8.0.2 contains an access control flaw that exposes draft, scheduled, and pending posts to unauthenticated users, creating a direct confidentiality risk…. A patch is available.

Is there a public PoC exploit available for CVE-2026-4338?

Yes, a public proof-of-concept exploit is available for CVE-2026-4338. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-4338?

Within 24 hours: Audit all WordPress instances for ActivityPub plugin installations and current versions. Within 7 days: Update ActivityPub plugin to version 8.0.2 or later on all affected systems. Within 30 days: Conduct content review to determine if draft/scheduled/pending posts were exposed; implement access logging on post visibility changes to detect past unauthorized access.

WordPress CVE-2026-4338

EUVD-2026-20058 HIGH

2026-04-08 WPScan

GHSA-v6vj-m59r-f4gf

WordPress Information Disclosure

7.5

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 06:02 EUVD-patch-fix

executive_summary

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

Patch available

Apr 16, 2026 - 05:29 EUVD

8.0.2

PoC Detected

Apr 08, 2026 - 21:26 vuln.today

Public exploit code

EUVD ID Assigned

Apr 08, 2026 - 06:30 euvd

EUVD-2026-20058

Analysis Generated

Apr 08, 2026 - 06:30 vuln.today

CVE Published

Apr 08, 2026 - 06:00 nvd

HIGH 7.5

DescriptionNVD

The ActivityPub WordPress plugin before 8.0.2 does not properly filter posts to be displayed, allowed unauthenticated users to access drafts/scheduled/pending posts

AnalysisAI

Improper access control in the ActivityPub WordPress plugin before 8.0.2 exposes draft, scheduled, and pending posts to unauthenticated remote users, resulting in confidentiality breach. This information disclosure vulnerability (CVSS 7.5) allows network-based attackers to access unpublished content without authentication or user interaction. …

RemediationAI

Within 24 hours: Audit all WordPress instances for ActivityPub plugin installations and current versions. Within 7 days: Update ActivityPub plugin to version 8.0.2 or later on all affected systems. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

Full analysis requires sign-in

Get intelligence summaries, risk assessment, exploit details, threat intel, and remediation guidance.

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CVE-2026-4338 vulnerability details – vuln.today

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WordPress CVE-2026-4338

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

Full analysis requires sign-in

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External POC / Exploit Code