CVE-2021-24386Public exploitNetwork attack vector

Stored XSS via unsanitized SVG uploads

Published Jul 6, 2021 · Updated Aug 3, 2024

Stored XSS in ShortPixel WP SVG Images before 3.4 allows remote authenticated users to execute script via a malicious SVG upload. The upload path accepts author-submitted SVG markup without sanitizing embedded JavaScript, and the script runs when the stored file is opened directly. Author-level access and a second user's direct visit to the uploaded file are required, allowing script execution in that visitor's browser.

CVSS severity5.4
Medium
EPSS probability0.66%
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 ShortPixel WP SVG Images before 3.4 allows remote authenticated users to execute script via a malicious SVG upload. The upload path accepts author-submitted SVG markup without sanitizing embedded JavaScript, and the script runs when the stored file is opened directly. Author-level access and a second user's direct visit to the uploaded file are required, allowing script execution in that visitor's browser.

The record

CVE
CVE-2021-24386
Published
Jul 6, 2021
Updated
Aug 3, 2024
Vendor
ShortPixel
Product
WP SVG Images
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 6, 2021CVE 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=3.4 <3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ShortPixel · WP SVG Imagesversion=3.4 <3.4

Published CVSS scores

5.4NIST NVDCVSS: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.

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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 exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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