CVE-2025-58266 WordPress Gianism plugin <= 6.0.0 - Cross Site Scripting (XSS) vulnerability

Q: What is CVE-2025-58266?

CVE-2025-58266 is a medium-severity cross-site scripting vulnerability in Fumiki Takahashi Gianism, published on 22 Sep 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Q: Is CVE-2025-58266 being exploited?

There is no known exploitation of CVE-2025-58266 in the wild and no public exploit code.

Medium 5.9 Published 22 Sep 2025 Updated 13 May 2026

Stored XSS in Gianism plugin allows attackers to inject malicious scripts, potentially leading to session hijacking or code execution.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2025-58266?

CVE-2025-58266 is a medium-severity cross-site scripting vulnerability in Fumiki Takahashi Gianism, published on 22 Sep 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Fumiki Takahashi Gianism gianism allows Stored XSS.This issue affects Gianism: from n/a through <= 6.0.0.

Weakness: CWE-79

Which versions are affected by CVE-2025-58266?

Linux distribution packages (1)

rust-keylime openSUSE:Tumbleweed All versions 0.2.7+141-1.1

How do I fix CVE-2025-58266?

Upgrade to a fixed version.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-58266 being exploited?