What is the CVSS score of CVE-2026-22351?

CVE-2026-22351 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: 0.1%.

Which versions of Marcus are affected by CVE-2026-22351?

CVE-2026-22351 presents notable security risk, a missing authorization vulnerability rated CVSS 6.5. Attackers could gain access beyond their authorized level.

How to fix or mitigate CVE-2026-22351?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Marcus CVE-2026-22351

HIGH

Missing Authorization (CWE-862)

2026-02-20 audit@patchstack.com

Authentication Bypass

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

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

Re-analysis Queued

Apr 23, 2026 - 15:43 vuln.today

cvss_changed

Severity Changed

Apr 23, 2026 - 15:43 NVD

MEDIUM HIGH

CVSS changed

Apr 23, 2026 - 15:43 NVD

6.5 (MEDIUM) 7.5 (HIGH)

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

CVE Published

Feb 20, 2026 - 16:22 nvd

MEDIUM 6.5

DescriptionCVE.org

Missing Authorization vulnerability in Marcus (aka @msykes) WP FullCalendar wp-fullcalendar allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WP FullCalendar: from n/a through <= 1.6.

AnalysisAI

WP FullCalendar plugin version 1.6 and earlier for WordPress contains an authorization bypass vulnerability that allows unauthenticated attackers to modify calendar data and disrupt service availability. The weak access control implementation enables remote exploitation without requiring user interaction or special network conditions. Organizations running affected versions should upgrade immediately as no patch is currently available.

Technical ContextAI

Classified as CWE-862 (Missing Authorization). Missing Authorization vulnerability in Marcus (aka @msykes) WP FullCalendar wp-fullcalendar allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WP FullCalendar: from n/a through <= 1.6.

Affected ProductsAI

Missing Authorization vulnerability in Marcus (aka @msykes) WP FullCalendar wp-fullcalendar allows Exploiting Incorrectly Configured Access Control Se