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

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-07 · updated 2026-06-17
Weakness: CWE-918

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.

Affected products

papra-hq papra: before 26.4.0 — fixed in 26.4.0

How to fix

Upgrade to a fixed version: papra-hq papra 26.4.0. Check the vendor advisory for mitigations.

References

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