CVE-2026-45343 LinkAce - Stored XSS via Unsanitized SSO User's Name Rendered in Admin Audit Log Allows Session Hijacking
Stored XSS in LinkAce admin audit log allows attackers to hijack admin sessions via malicious OAuth display names.
- 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-2026-45343?
CVE-2026-45343 is a high-severity cross-site scripting vulnerability in Kovah LinkAce, published on 28 May 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 2.5.6, LinkAce contains a stored cross-site scripting vulnerability that allows a low-privilege user to execute arbitrary JavaScript in an administrator's browser session. This affects instances configured with SSO/OAuth authentication, which is one of the supported authentication methods in LinkAce. An attacker who sets their OAuth display name to a malicious script and then creates an API token will plant a persistent XSS payload in the audit log. When any admin navigates to /system/audit, the payload executes in the admin's browser context. This enables session cookie theft, CSRF token exfiltration (exposed in the la-app-data meta tag), or any other action the admin can perform. This vulnerability is fixed in 2.5.6.
Weakness: CWE-79
Which versions are affected by CVE-2026-45343?
How do I fix CVE-2026-45343?
No fix has been published for CVE-2026-45343 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-2026-45343 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45343 exists.
Sources
Also known as GHSA-jx4g-ph82-x9mm.