CVE-2025-63708Public exploitNetwork attack vector

JavaScript execution via unsanitized font family names

Published Nov 17, 2025 · Updated Nov 17, 2025

Cross-site scripting in SourceCodester AI Font Matcher 2025-10-10 allows remote attackers to execute JavaScript in victims' browsers. The client trusts font family names returned by the webfonts fetch and processes them without sanitization, allowing script-bearing values to enter the page context. Exploitation requires control or interception of that response and victim interaction with the affected UI; executed code can read non-HttpOnly cookies and act in the victim's session.

CVSS severity6.1
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in SourceCodester AI Font Matcher 2025-10-10 allows remote attackers to execute JavaScript in victims' browsers. The client trusts font family names returned by the webfonts fetch and processes them without sanitization, allowing script-bearing values to enter the page context. Exploitation requires control or interception of that response and victim interaction with the affected UI; executed code can read non-HttpOnly cookies and act in the victim's session.

The record

CVE
CVE-2025-63708
Published
Nov 17, 2025
Updated
Nov 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo