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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.

PUBLISHED Reserved 2026-06-26 | Published 2026-06-29 | Updated 2026-07-14 | Assigner VulnCheck




LOW: 2.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

MEDIUM: 4.7CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Problem types

Permissive Cross-domain Security Policy with Untrusted Domains

Product status

Default status
unaffected

Any version
affected

Credits

George Chen finder

References

github.com/papermark/papermark/issues/2178 (Researcher Disclosure) issue-tracking

github.com/AstoKr/papermark/pull/1 (Findings Summary) issue-tracking

www.vulncheck.com/...configuration-in-viewer-upload-endpoint third-party-advisory

cve.org (CVE-2026-57957)

nvd.nist.gov (CVE-2026-57957)

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