CVE-2026-100388

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-25. A secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

RustDesk versions before 1.5.0 fail to properly validate file transfer permissions on incoming file clipboard messages in the Cliprdr message handler on Linux and macOS. Authenticated remote peers with disabled file transfer permissions can place files onto the host clipboard and retrieve copied files and contents from the process-wide clipboard cache.

CVSS v3
5.4
EG Score
5.4MEDIUMhigh confidence
EG Risk
24
EG Risk 24/100CISA 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (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 25, 2026

Last Modified

September 30, 2026

Advisory Details (5)

Auto-updated Sep 25, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

RustDesk before 1.5.0 Missing Authorization Check on Incoming File Clipboard Messages | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rustdesk-before-1.5.0-missing-authorization-check-on-incoming-file-clipboard-messages
generic

GitHub - rustdesk/rustdesk: An open-source remote desktop application designed for self-hosting, as an alternative to TeamViewer. · GitHub

https://github.com/rustdesk/rustdesk
generic

rustdesk/src/server/connection.rs at 1.4.9 · rustdesk/rustdesk · GitHub

https://github.com/rustdesk/rustdesk/blob/1.4.9/src/server/connection.rs#L3074-L3092
github_commit

commit f299fb990600 (rustdesk/rustdesk)

Fix landed in rustdesk/rustdesk commit f299fb990600 — awaiting tagged release

https://github.com/rustdesk/rustdesk/commit/f299fb9906006247863250d7dfaa016f29eef7a4
github_pr

fix(clipboard): unix, check file transfer permission on incoming file…

Fix merged in rustdesk/rustdesk PR #16333 on 2026-09-24 — awaiting tagged release

https://github.com/rustdesk/rustdesk/pull/16333

Vendor Advisories for CVE-2026-100388(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 20× in last 7d / 28× 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. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 10:40 UTCEG score recompute
  3. 2026-10-04 10:40 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 08:23 UTCEG score recompute
  6. 2026-10-03 08:23 UTCGHSA enrichment
  7. 2026-10-02 06:04 UTCEG score recompute
  8. 2026-10-02 06:04 UTCGHSA enrichment
  9. 2026-10-01 19:49 UTCEPSS rescore
  10. 2026-10-01 03:47 UTCEG score recompute
  11. 2026-10-01 03:47 UTCGHSA enrichment
  12. 2026-09-30 15:02 UTCEPSS rescore
  13. 2026-09-30 01:30 UTCEG score recompute
  14. 2026-09-30 01:30 UTCGHSA enrichment
  15. 2026-09-30 00:39 UTCEG score recompute
  16. 2026-09-30 00:39 UTCGHSA enrichment
  17. 2026-09-29 15:20 UTCEPSS rescore
  18. 2026-09-29 04:10 UTCEG score recompute
  19. 2026-09-29 04:10 UTCGHSA enrichment
  20. 2026-09-28 13:50 UTCEPSS rescore
  21. 2026-09-28 01:53 UTCEG score recompute
  22. 2026-09-28 01:53 UTCGHSA enrichment
  23. 2026-09-26 23:35 UTCEG score recompute
  24. 2026-09-26 23:35 UTCGHSA enrichment
  25. 2026-09-26 15:58 UTCEPSS rescore
Show 3 more
  1. 2026-09-25 21:19 UTCEG score recompute
  2. 2026-09-25 20:24 UTCEG score recompute
  3. 2026-09-25 20:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-100388?
CVE-2026-100388 is a medium vulnerability published on September 25, 2026. RustDesk versions before 1.5.0 fail to properly validate file transfer permissions on incoming file clipboard messages in the Cliprdr message handler on Linux and macOS. Authenticated remote peers with disabled file transfer permissions can place files onto the host clipboard and retrieve copied…
When was CVE-2026-100388 disclosed?
CVE-2026-100388 was first published on September 25, 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-2026-100388 actively exploited?
CVE-2026-100388 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100388?
CVE-2026-100388 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100388?
An upstream fix for CVE-2026-100388 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-100388 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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