CVE-2024-56256Network attack vector

Stored XSS via undisclosed rendering flaw

Published Dec 31, 2024 · Updated Apr 28, 2026

Stored XSS in Andy Fragen Embed PDF Viewer 2.3.1 and earlier allows remote authenticated users to inject scripts via page content. Patchstack identifies Editor privileges and a victim action, but the public CNA record and advisory do not disclose the affected field, rendering function, or missing sanitization or escaping operation. Injected scripts execute when visitors open a crafted page, exposing that page's browser context to the editor-level attacker.

CVSS severity5.9
Medium
EPSS probability0.24%
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 Andy Fragen Embed PDF Viewer 2.3.1 and earlier allows remote authenticated users to inject scripts via page content. Patchstack identifies Editor privileges and a victim action, but the public CNA record and advisory do not disclose the affected field, rendering function, or missing sanitization or escaping operation. Injected scripts execute when visitors open a crafted page, exposing that page's browser context to the editor-level attacker.

The record

CVE
CVE-2024-56256
Published
Dec 31, 2024
Updated
Apr 28, 2026
Vendor
Andy Fragen
Product
Embed PDF Viewer
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record 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 <=2.3.1 changes=[{"at":"2.4.0","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Andy Fragen · Embed PDF Viewerversion=0 <=2.3.1 changes=[{"at":"2.4.0","status":"unaffected"}]

Published CVSS scores

5.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
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.

Technologies

Your stack

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Your stack

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