PT-2026-53675 · Papermark · Papermark

George Chen · Published 2026-06-29 · Updated 2026-06-29 · CVE-2026-57957

NVD

CVSS v3.1

4.7

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

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.

Fix

Weakness Enumeration

CWE-942

Related Identifiers

CVE-2026-57957

Affected Products

Papermark

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-57957 · Security Note
• https://github.com/papermark/papermark/issues/2178 · Note
• https://vulncheck.com/advisories/papermark-cors-misconfiguration-in-viewer-upload-endpoint · Note
• https://github.com/AstoKr/papermark/pull/1 · Note