CVE-2026-93353

MEDIUMPre-NVD 3.15.3▲
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-09-24. A secondary CVSS source baseline 3.1; sources differ by 2.2.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 3.1Exploit: Elevated riskExposed services: Not assessed

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

copyparty contains a volume restriction bypass vulnerability in its SFTP front end that allows authenticated SFTP users to create, remove, and truncate arbitrary paths outside permitted volume boundaries by exploiting three handlers that bypass the xvol volflag enforcement. The _mkdir, _rmdir, and _chattr handlers construct destination paths using vfs.get(), vn.canonical(), and os.path.join() without invoking the chk_ap access check, enabling attackers to traverse symlinks leaving a volume's top directory and perform unauthorized file creation, deletion, or truncation via SSH_FXP_SETSTAT operations on paths outside any volume the account is authorized to access.

CVSS v3
3.1
EG Score
5.3MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
17th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 24, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Sep 24, 2026
No patch confirmed yet.
generic

copyparty SFTP Volume Restriction Bypass via mkdir/rmdir/chattr Handlers | Advisories | VulnCheck

https://www.vulncheck.com/advisories/copyparty-sftp-volume-restriction-bypass-via-mkdir-rmdir-chattr-handlers
generic

CVE-2026-93353: a volume guard enforced one call site at a time — h3llh0und

https://euriconicacio.github.io/blog/cve-2026-93353-a-volume-guard-enforced-one-call-site-at-a-time/

Vendor Advisories for CVE-2026-93353(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 36× 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. 2026-10-03 23:29 UTCEG score recompute
  2. 2026-10-03 23:29 UTCGHSA enrichment
  3. 2026-10-03 14:26 UTCEPSS rescore
  4. 2026-10-02 22:47 UTCEG score recompute
  5. 2026-10-02 22:47 UTCGHSA enrichment
  6. 2026-10-01 22:03 UTCEG score recompute
  7. 2026-10-01 22:02 UTCGHSA enrichment
  8. 2026-10-01 19:51 UTCEPSS rescore
  9. 2026-09-30 21:18 UTCGHSA enrichment
  10. 2026-09-30 20:56 UTCEG score recompute
  11. 2026-09-30 20:56 UTCGHSA enrichment
  12. 2026-09-30 20:55 UTCMITRE cvelistV5CVSS v3 → 3.1 · CVSS v4 → 2.3 · severity → LOW
  13. 2026-09-30 15:04 UTCEPSS rescore
  14. 2026-09-29 23:53 UTCEG score recompute
  15. 2026-09-29 23:52 UTCGHSA enrichment
  16. 2026-09-28 21:18 UTCEG score recompute
  17. 2026-09-28 21:18 UTCGHSA enrichment
  18. 2026-09-28 20:26 UTCEG score recompute
  19. 2026-09-28 20:26 UTCGHSA enrichment
  20. 2026-09-28 18:38 UTCEG score recompute
  21. 2026-09-28 18:38 UTCGHSA enrichment
  22. 2026-09-28 13:52 UTCEPSS rescore
  23. 2026-09-28 13:52 UTCEPSS rescore
  24. 2026-09-27 17:55 UTCEG score recompute
  25. 2026-09-27 17:55 UTCGHSA enrichment
Show 11 more
  1. 2026-09-27 13:49 UTCEPSS rescore
  2. 2026-09-26 17:12 UTCEG score recompute
  3. 2026-09-26 17:11 UTCGHSA enrichment
  4. 2026-09-26 15:59 UTCEPSS rescore
  5. 2026-09-25 16:27 UTCEG score recompute
  6. 2026-09-25 16:27 UTCGHSA enrichment
  7. 2026-09-25 15:55 UTCEG score recompute
  8. 2026-09-25 15:54 UTCGHSA enrichment
  9. 2026-09-24 21:22 UTCEG score recompute
  10. 2026-09-24 20:37 UTCEG score recompute
  11. 2026-09-24 20:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-93353?
CVE-2026-93353 is a medium vulnerability published on September 24, 2026. copyparty contains a volume restriction bypass vulnerability in its SFTP front end that allows authenticated SFTP users to create, remove, and truncate arbitrary paths outside permitted volume boundaries by exploiting three handlers that bypass the xvol volflag enforcement. The mkdir, rmdir, and…
When was CVE-2026-93353 disclosed?
CVE-2026-93353 was first published on September 24, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-93353 actively exploited?
CVE-2026-93353 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (17th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-93353?
CVE-2026-93353 has a CVSS base score of 3.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 5.3 (MEDIUM).
How do I remediate CVE-2026-93353?
No fix for CVE-2026-93353 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-93353 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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