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Vulnerabilities CVE-2026-57957

CVE-2026-57957

Low
Open
TLP:CLEAR

Papermark 0.22.0 - CORS Misconfiguration in Viewer Upload Endpoint

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Description

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.

Details

CVSS Score
2.3
EPSS Score
0.25%

16.4th percentile

CVSS 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
Confidence
90%
Published
Jun 29, 2026
Last Modified
Jul 14, 2026
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