CVE-2026-57957
Papermark 0.22.0 - CORS Misconfiguration in Viewer Upload Endpoint
- State
- Published
- Severity
- 2.3 Low
- Published
- Jun 29, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jun 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.3 Low | 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 | VulnCheck |
| 3.1 | 4.7 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-942 Permissive Cross-domain Security Policy with Untrusted Domains
Affected Products
| Product | Versions |
|---|---|
papermarkpapermark |
|
References
- Researcher Disclosureissue-tracking
- Findings Summaryissue-tracking
- https://www.vulncheck.com/advisories/papermark-cors-misconfiguration-in-viewer-upload-endpointthird-party-advisory
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