CVE-2026-57957

Papermark 0.22.0 - CORS Misconfiguration in Viewer Upload Endpoint

CVSS 2.3 LOWEPSS 0.3%CWE-942

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 2.3EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

29 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

papermark · papermark

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References

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