CVE-2020-9459Known exploitationNetwork attack vector

Stored XSS via unneutralized AJAX settings input

Published Feb 28, 2020 · Updated Aug 4, 2024

Stored XSS in Webnus Modern Events Calendar Lite 5.1.6 and earlier allows remote authenticated users to inject scripts via AJAX actions. The mec_save_notifications and import_settings handlers store attacker-controlled JavaScript, HTML, or CSS without neutralizing it. Subscriber-level access is sufficient; payloads execute in affected dashboard or front-end views and can enable rogue administrator creation.

CVSS severity5.4
Medium
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Webnus Modern Events Calendar Lite 5.1.6 and earlier allows remote authenticated users to inject scripts via AJAX actions. The mec_save_notifications and import_settings handlers store attacker-controlled JavaScript, HTML, or CSS without neutralizing it. Subscriber-level access is sufficient; payloads execute in affected dashboard or front-end views and can enable rogue administrator creation.

The record

CVE
CVE-2020-9459
Published
Feb 28, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 28, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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