CVE-2024-9428Public exploitNetwork attack vector

Admin-level stored XSS via unsanitized image Alt Text

Published Dec 12, 2024 · Updated Dec 12, 2024

Stored XSS in Sygnoos Popup Builder before 4.3.5 allows remote authenticated users to execute JavaScript through image Alt Text. The image-popup editor stores an Alt Text value without sanitizing or escaping it, then inserts the value into rendered popup markup. An administrator-level account can inject the payload even when unfiltered_html is disabled, and a visitor must view the popup for execution.

CVSS severity4.8
Medium
EPSS probability0.34%
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 Sygnoos Popup Builder before 4.3.5 allows remote authenticated users to execute JavaScript through image Alt Text. The image-popup editor stores an Alt Text value without sanitizing or escaping it, then inserts the value into rendered popup markup. An administrator-level account can inject the payload even when unfiltered_html is disabled, and a visitor must view the popup for execution.

The record

CVE
CVE-2024-9428
Published
Dec 12, 2024
Updated
Dec 12, 2024
Vendor
Sygnoos
Product
Popup Builder
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 12, 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=0 <4.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Sygnoos · Popup Builderversion=0 <4.3.5

Published CVSS scores

4.8CISA-ADPCVSS: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')
CAPEC-592Stored XSS
T1059.007JavaScript/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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