CVE-2026-35461 Papra has a Blind Server-Side Request Forgery (SSRF) via Webhook URL

Medium 5.0 Published 7 Apr 2026 Updated 9 Apr 2026

Authenticated users can trigger server-side requests to internal or cloud metadata endpoints via unvalidated webhook URLs, potentially exposing sensitive data.

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-2026-35461?

CVE-2026-35461 is a medium-severity server-side request forgery vulnerability in papra-hq papra, published on 7 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Papra is a minimalistic document management and archiving platform. Prior to 26.4.0, the Papra webhook system allows authenticated users to register arbitrary URLs as webhook endpoints with no validation of the destination address. The server makes outbound HTTP POST requests to registered URLs, including localhost, internal network ranges, and cloud provider metadata endpoints, on every document event. This vulnerability is fixed in 26.4.0.

Weakness: CWE-918

Which versions are affected by CVE-2026-35461?

It affects 1 product.

Products include Papra Papra.

How do I fix CVE-2026-35461?

No fix has been published for CVE-2026-35461 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-2026-35461 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35461 exists.

Sources

Also known as GHSA-cjw7-qg95-58mq.