CVE-2021-24977 - CVE House
Back to Database
Status published Medium CVE-2021-24977

Use Any Font < 6.2.1 - Unauthenticated Arbitrary CSS Appending

Vulnerability Description

The Use Any Font | Custom Font Uploader WordPress plugin before 6.2.1 does not have any authorisation checks when assigning a font, allowing unauthenticated users to sent arbitrary CSS which will then be processed by the frontend for all users. Due to the lack of sanitisation and escaping in the backend, it could also lead to Stored XSS issues

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-24977

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Krzysztof Zając

References

More from Unknown

View All →
CVE-2025-9978
Jeg Elementor Kit < 2.7.0 - Author+ Stored XSS
Unknown 0
CVE-2025-9959
Sandbox escape in smolagents Local Python execution environment via dunder attributes
High 7.6
CVE-2025-9900
Libtiff: libtiff write-what-where
High 8.8
CVE-2025-9784
Undertow: undertow madeyoureset http/2 ddos vulnerability
High 7.5
CVE-2025-9710
Responsive Lightbox & Gallery < 2.5.3 - Unauthenticated Stored-XSS via Comments
Unknown 0

Affected Vendor

Affected Software

Use Any Font | Custom Font Uploader
Vulnerable Versions:
6.2.1

Timeline

Official Publish: February 28th, 2022
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-862

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1078 Valid Accounts
Persistence
T1531 Account Access Removal
Impact