CVE-2022-4670Public exploitNetwork attack vector

Stored XSS via unescaped shortcode attributes

Published Feb 6, 2023 · Updated Mar 25, 2025

Stored XSS in PDF.js Viewer before 2.1.8 allows remote authenticated users to execute scripts through crafted shortcode attributes. The shortcode renderer returns attributes such as viewer_height in page or post markup without validation or output escaping. Contributor-level access is sufficient, and the injected script executes in a visitor's browser when the affected page is viewed.

CVSS severity5.4
Medium
EPSS probability0.56%
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 PDF.js Viewer before 2.1.8 allows remote authenticated users to execute scripts through crafted shortcode attributes. The shortcode renderer returns attributes such as viewer_height in page or post markup without validation or output escaping. Contributor-level access is sufficient, and the injected script executes in a visitor's browser when the affected page is viewed.

The record

CVE
CVE-2022-4670
Published
Feb 6, 2023
Updated
Mar 25, 2025
Vendor
Ben Lawson
Product
PDF.js Viewer
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2025Record 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 <2.1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ben Lawson · PDF.js Viewerversion=0 <2.1.8

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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 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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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