Medium 4.7Published Jun 29, 2026

CVE-2026-57957Papermark 0.22.0 - CORS Misconfiguration in Viewer Upload Endpoint

Updated under an hour ago (Oct 27, 2026, 4:00 PM ET)

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Exploited in the last 30 days

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: 4.7 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Weakness (CWE): CWE-942
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

papermark papermark papermark:papermark (from the name)	through 0.22.0	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.