Modern Events Calendar lite < 7.1.0 - Authenticated (Admin+) Stored Cross-Site Scripting

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Summary

CVECVE-2023-4021
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-10-20 08:15:12 UTC
Updated2026-04-08 19:18:28 UTC
DescriptionThe Modern Events Calendar lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Google API key and Calendar ID in versions up to, but not including, 7.1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Risk And Classification

Primary CVSS: v3.1 4.8 MEDIUM from [email protected]

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

EPSS: 0.001560000 probability, percentile 0.363800000 (date 2026-04-09)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Webnus Modern Events Calendar Lite All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Webnus Modern Events Calendar Lite affected 7.1.0 semver Not specified

References

ReferenceSourceLinkTags
Modern Events Calendar lite < 7.1.0 - Authenticated (Admin+) Stored Cross-Site Scripting af854a3a-2127-422b-91ae-364da2661108 www.wordfence.com Third Party Advisory
StackPath af854a3a-2127-422b-91ae-364da2661108 webnus.net Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Marco Wotschka (en)

Additional Advisory Data

SourceTimeEvent
CNA2023-07-31T00:00:00.000ZDiscovered
CNA2023-07-31T00:00:00.000ZVendor Notified
CNA2023-09-28T00:00:00.000ZDisclosed
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