CVE-2024-8920Network attack vector

Stored XSS via unsanitized SVG uploads

Published Oct 17, 2024 · Updated Apr 8, 2026

Stored XSS in Fonto – Custom Web Fonts Manager 1.2.1 and earlier allows remote authenticated users to inject scripts through SVG uploads. The SVG upload path accepts active content without sufficient sanitization and later serves the file without adequate output escaping, so embedded script executes in a visitor's browser. Author-level access or higher is required to upload the SVG, and execution occurs when a user accesses the uploaded file, exposing that user's browser session to attacker-controlled script.

CVSS severity6.4
Medium
EPSS probability0.36%
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 Fonto – Custom Web Fonts Manager 1.2.1 and earlier allows remote authenticated users to inject scripts through SVG uploads. The SVG upload path accepts active content without sufficient sanitization and later serves the file without adequate output escaping, so embedded script executes in a visitor's browser. Author-level access or higher is required to upload the SVG, and execution occurs when a user accesses the uploaded file, exposing that user's browser session to attacker-controlled script.

The record

CVE
CVE-2024-8920
Published
Oct 17, 2024
Updated
Apr 8, 2026
Vendor
Vlad Olaru
Product
Fonto – Custom Web Fonts Manager
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <=1.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vlad Olaru · Fonto – Custom Web Fonts Managerversion=0 <=1.2.1

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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