CVE-2026-57957

Summary

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.

Affected Software

Weaknesses

• CWE-942: Permissive Cross-domain Security Policy with Untrusted Domains

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

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

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