CVE-2025-8101 Linkify 4.3.1 - Prototype Pollution & HTML Attribute Injection (XSS)
Attackers can inject malicious HTML attributes via prototype pollution in the Linkify library, leading to cross-site scripting attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-8101?
CVE-2025-8101 is a high-severity cross-site scripting vulnerability in Linkify, published on 25 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability in Linkify (linkifyjs) allows XSS Targeting HTML Attributes and Manipulating User-Controlled Variables.This issue affects Linkify: from 4.3.1 before 4.3.2.
Weakness: CWE-1321
Which versions are affected by CVE-2025-8101?
2 open source packages ship an affected version, including linkifyjs.
| Package | Affected | Fixed in |
|---|---|---|
linkifyjs npm | From 4.3.1 | 4.3.2 |
linkifyjs npm | From 4.3.1 | 4.3.2 |
How do I fix CVE-2025-8101?
Upgrade linkifyjs to 4.3.2 or later.
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-2025-8101 being exploited?
There is no known exploitation of CVE-2025-8101 in the wild and no public exploit code.
Sources
Also known as CLSA-2026-1783040464, CLSA-2026-1792864663, CLSA-2026-1793007594, CLSA-2026-1793146498, CLSA-2026-1793152364, CLSA-2026-1793156743 and 2 more.