CVE-2026-57957

MEDIUMPre-NVD 4.74.7—
EchelonGraph scoreHIGH confidence

Score 4.7 from GitHub Security Advisory (severity: LOW) published 2026-06-29. a secondary CVSS source baseline 4.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.7Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
4.7
EG Score
4.7(high)
EPSS
16.2%
KEV
Not listed

Published

June 29, 2026

Last Modified

July 1, 2026

Advisory Details (3)

Auto-updated Jun 29, 2026
No patch confirmed yet. Sources: github_pr.
generic

Papermark 0.22.0 - CORS Misconfiguration in Viewer Upload Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/papermark-cors-misconfiguration-in-viewer-upload-endpoint
generic

CORS Misconfiguration on Viewer Upload Endpoint · Issue #2178 · papermark/papermark · GitHub

https://github.com/papermark/papermark/issues/2178
github_pr

White-box bug bounty: task-whitebox-papermark

Upstream fix in progress (PR #1 · AstoKr/papermark, state=open)

https://github.com/AstoKr/papermark/pull/1

Vendor Advisories for CVE-2026-57957(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 24× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 15:25 UTCEG score recompute
  4. 2026-07-06 15:24 UTCGHSA enrichment
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 15:45 UTCEG score recompute
  8. 2026-07-05 15:45 UTCGHSA enrichment
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 16:09 UTCEG score recompute
  12. 2026-07-04 16:08 UTCGHSA enrichment
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 16:30 UTCEG score recompute
  16. 2026-07-03 16:30 UTCGHSA enrichment
  17. 2026-07-02 16:54 UTCEG score recompute
  18. 2026-07-02 16:54 UTCGHSA enrichment
  19. 2026-07-01 17:17 UTCEG score recompute
  20. 2026-07-01 17:17 UTCGHSA enrichment
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 17:41 UTCEG score recompute
  24. 2026-06-30 17:41 UTCGHSA enrichment
  25. 2026-06-29 18:03 UTCEG score recompute
Show 1 more
  1. 2026-06-29 18:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-57957?
CVE-2026-57957 is a medium vulnerability published on June 29, 2026. 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…
When was CVE-2026-57957 disclosed?
CVE-2026-57957 was first published in the National Vulnerability Database on June 29, 2026, with the most recent update on July 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57957 actively exploited?
CVE-2026-57957 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-57957?
CVE-2026-57957 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-57957?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57957, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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