CVE-2022-2374Public exploitNetwork attack vector

Stored XSS via unsanitized Custom CSS setting

Published Aug 29, 2022 · Updated Aug 3, 2024

Stored XSS in N Squared Digital Simply Schedule Appointments before 1.5.7.7 allows remote authenticated users to inject scripts through Custom CSS. The Styles panel stores a Custom CSS value without sanitizing or escaping it, then inserts the value into pages that render a booking shortcode. Administrative access and a multisite installation or disabled unfiltered_html capability are required; visitors loading the booking page execute the stored script in the site's origin.

CVSS severity4.8
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in N Squared Digital Simply Schedule Appointments before 1.5.7.7 allows remote authenticated users to inject scripts through Custom CSS. The Styles panel stores a Custom CSS value without sanitizing or escaping it, then inserts the value into pages that render a booking shortcode. Administrative access and a multisite installation or disabled unfiltered_html capability are required; visitors loading the booking page execute the stored script in the site's origin.

The record

CVE
CVE-2022-2374
Published
Aug 29, 2022
Updated
Aug 3, 2024
Vendor
N Squared Digital, LLC
Product
Simply Schedule Appointments
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.5.7.7 <1.5.7.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

N Squared Digital, LLC · Simply Schedule Appointmentsversion=1.5.7.7 <1.5.7.7

Published CVSS scores

5.5Wordfence IntelligenceCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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

Technologies

Your stack

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Your stack

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