CVE-2026-49436 LinkAce vulnerable to stored XSS via 'javascript:' URI in Bulk Link API
Authenticated users can inject JavaScript via the Bulk Link API, leading to session hijacking and cookie theft when victims click the malicious link.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-49436?
CVE-2026-49436 is a high-severity cross-site scripting vulnerability in Kovah LinkAce, published on 20 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
LinkAce is a self-hosted archive to collect website links. Prior to version 2.5.7, the Bulk Link API endpoint (`POST /api/v2/bulk/links`) accepts URLs without any format validation, allowing an authenticated user to store a `javascript:` URI. The stored URI is later rendered verbatim as an `href` in Blade templates, and clicking it executes arbitrary JavaScript in the victim's browser — exfiltrating cookies and session tokens. Version 2.5.7 fixes the issue.
Weakness: CWE-79
Which versions are affected by CVE-2026-49436?
How do I fix CVE-2026-49436?
No fix has been published for CVE-2026-49436 yet. Limit exposure of the affected software until one is available.
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-2026-49436 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49436 exists.
Sources
Also known as GHSA-6r73-pchm-4m39.