CVE-2026-90807

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-09-14. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: Elevated riskExposed: 0

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

A vulnerability was found in nanocoai NanoClaw up to 2.1.17. This issue affects the function forwardAttachedFiles of the file src/modules/agent-to-agent/agent-route.ts of the component Attachment Handler. The manipulation results in link following. The attack may be performed from remote. The exploit has been made public and could be used. The patch is identified as 3f9ed607b7e7a4872747295f75286f1c377d7c33. It is advisable to implement a patch to correct this issue.

CVSS v3
6.3
EG Score
6.3(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

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
Severity63% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 16, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

GitHub - nanocoai/nanoclaw: A lightweight alternative to OpenClaw that runs in containers for security. Connects to WhatsApp, Telegram, Slack, Discord, Gmail and other messaging apps,, has memory, scheduled jobs, and runs directly on Anthropic's Agents SDK · GitHub

https://github.com/nanocoai/nanoclaw/
github_commit

commit 3f9ed607b7e7 (nanocoai/nanoclaw)

Fix landed in nanocoai/nanoclaw commit 3f9ed607b7e7 — awaiting tagged release

https://github.com/nanocoai/nanoclaw/commit/3f9ed607b7e7a4872747295f75286f1c377d7c33
generic

[Security] NanoClaw A2A attachment forwarding follows a symlinked inbox and writes outside the target session root · Issue #2828 · nanocoai/nanoclaw · GitHub

https://github.com/nanocoai/nanoclaw/issues/2828

Vendor Advisories for CVE-2026-90807(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 25× in last 7d / 25× 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. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 10:39 UTCEG score recompute
  3. 2026-09-20 10:39 UTCGHSA enrichment
  4. 2026-09-19 12:25 UTCEG score recompute
  5. 2026-09-19 12:25 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 14:16 UTCEG score recompute
  8. 2026-09-18 14:16 UTCGHSA enrichment
  9. 2026-09-17 19:32 UTCEPSS rescore
  10. 2026-09-17 16:01 UTCGHSA enrichment
  11. 2026-09-16 17:51 UTCEG score recompute
  12. 2026-09-16 17:51 UTCGHSA enrichment
  13. 2026-09-16 17:21 UTCNVD updateCVSS v4 → 2.1
  14. 2026-09-16 16:55 UTCEG score recompute
  15. 2026-09-16 16:55 UTCGHSA enrichment
  16. 2026-09-16 16:19 UTCMITRE cvelistV5CVSS v4 → 5.3
  17. 2026-09-16 14:09 UTCEPSS rescore
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-15 19:12 UTCGHSA enrichment
  20. 2026-09-14 21:02 UTCEG score recompute
  21. 2026-09-14 21:02 UTCGHSA enrichment
  22. 2026-09-14 18:31 UTCEG score recompute
  23. 2026-09-14 18:29 UTCNVD updateCVSS v4 → 2.1
  24. 2026-09-14 17:50 UTCEG score recompute
  25. 2026-09-14 17:49 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90807?
CVE-2026-90807 is a medium vulnerability published on September 14, 2026. A vulnerability was found in nanocoai NanoClaw up to 2.1.17. This issue affects the function forwardAttachedFiles of the file src/modules/agent-to-agent/agent-route.ts of the component Attachment Handler. The manipulation results in link following. The attack may be performed from remote. The…
When was CVE-2026-90807 disclosed?
CVE-2026-90807 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90807 actively exploited?
CVE-2026-90807 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 78.3% of all scored CVEs.
What is the CVSS score of CVE-2026-90807?
CVE-2026-90807 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-90807?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90807, 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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