CVE-2026-57957CWE-942

Papermark 0.22.0 - CORS Misconfiguration in Viewer Upload Endpoint

Low · published June 29, 2026

CVSS v4.0
2.3
EPSS
0%
Percentile
36.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
2.3 · LOW
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
EPSS
0.00436 · 36.8th percentile
Weakness
CWE-942 · Permissive Cross-domain Security Policy with Untrusted Domains
Published
2026-06-29T17:23Z
EPSS history
Timeline
  • 29 JUN 17:23Z
    Papermark 0.22.0 - CORS Misconfiguration in Viewer Upload Endpoint
    cvelistv5