CVE-2026-33953 LinkAce's SSRF protection can be bypassed via internal hostname resolution in LinkAce

High 8.5 Published 27 Mar 2026 Updated 30 Mar 2026

Authenticated users can bypass SSRF protections to access internal services via hostname resolution in LinkAce.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-33953?

CVE-2026-33953 is a high-severity server-side request forgery vulnerability in Kovah LinkAce, published on 27 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

LinkAce is a self-hosted archive to collect website links. Versions prior to 2.5.3 block direct requests to private IP literals, but still performs server-side requests to internal-only resources when those resources are referenced through an internal hostname. This allows an authenticated user to trigger server-side requests to internal services reachable by the LinkAce server but not directly reachable by an external user. Version 2.5.3 patches the issue.

Weakness: CWE-918

Which versions are affected by CVE-2026-33953?

It affects 1 product.

Products include Linkace Linkace.

How do I fix CVE-2026-33953?

No fix has been published for CVE-2026-33953 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-33953 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33953 exists.

Sources

Also known as GHSA-wp4g-qw9j-wfjg.