CVE-2026-57957: Papermark

Medium severity, CVSS 4.7. EPSS: 0.4% chance of exploitation in the next 30 days.

Papermark through 0.22.0 contains a cross-origin resource sharing (CORS) misconfiguration vulnerability that allows unauthenticated remote attackers to perform credentialed cross-origin requests by exploiting the TUS-based viewer upload endpoint reflecting arbitrary request Origins with Access-Control-Allow-Credentials set to true. Attackers can lure authenticated victims to malicious pages that silently issue credentialed cross-origin requests to upload arbitrary files into victim datarooms and read credentialed responses.

Affected products

• Papermark Papermark: up to and including 0.22.0

Published 2026-06-29. Last modified 2026-07-14.