CVE-2026-57957

MEDIUM 4.7

Papermark 0.22.0 - CORS Misconfiguration in Viewer Upload Endpoint

CVSS Score

4.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-942
Vendor	papermark
Product	papermark
Published	Jun 29, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

papermark / papermark

0 ≤ 0.22.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/papermark/papermark/issues/2178 github.com: https://github.com/AstoKr/papermark/pull/1 vulncheck.com: https://www.vulncheck.com/advisories/papermark-cors-misconfiguration-in-viewer-upload-endpoint

Credits

George Chen