Attacks Dictionary
Cross-site scripting (XSS)
Definition
Cross-site scripting (XSS) injects malicious JavaScript into pages that other users’ browsers will run.
Also called: XSS, cross-site scripting, cross site scripting
Why it matters for WordPress
Stored XSS in a comment, page builder field, or admin notice can run in another user’s browser. For admins, that can mean stolen cookies, forced actions, or malware distribution to visitors.
How it shows up in practice
- Unexpected popups, redirects, or injected ads on the front end
- Admin screens that behave oddly after viewing a crafted piece of content
- Scanner or CVE notes mentioning reflected or stored XSS in a plugin
What to do
- Update vulnerable plugins and themes quickly.
- Limit who can publish unfiltered HTML.
- Sanitize and escape output in custom themes and plugins.
- Use a content security policy where practical (hosting or edge).
- Treat “odd JavaScript on my pages” as an incident: scan, review recent content, check users.
Full guide: WordPress XSS attacks.
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Nearby ideas in the dictionary
- CSRF CSRF tricks a logged-in browser into sending a request the user did not mean to send.
- Session hijacking Session hijacking steals or guesses a valid session so the attacker acts as the logged-in user.
- Vulnerability A vulnerability is a weakness in software that attackers can abuse to break confidentiality, integrity, or availability.