SiYuan before v3.8.1 contains a path traversal vulnerability in the asset.upload MCP tool that accepts arbitrary absolute file paths without workspace boundary validation. Attackers can induce the AI Agent to upload sensitive files such as SSH keys or credentials from outside the workspace into the asset directory through prompt injection.
CVE-2026-82233
MEDIUMPre-NVD 5.75.7—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 5.7 from GitHub Security Advisory published 2026-08-28. a secondary CVSS source baseline 5.7; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
5.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.7Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.7
- EG Score
- 5.7(high)
- EG Risk
- 30(Track)EG Risk 30/100SSVC: 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 computedSeverity57% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 21%
- KEV
- Not listed
Published
August 28, 2026
Last Modified
August 28, 2026
Advisory Details (2)
Auto-updated Aug 28, 2026🔬 Proof of concept available. Patch available. Sources: github.
generic
SiYuan before v3.8.1 Path Traversal via asset.upload | Advisories | VulnCheck
https://www.vulncheck.com/advisories/siyuan-before-3.8.1-path-traversal-via-asset-uploadgithub Patch Available🟡 PoC Available
SiYuan MCP asset.upload Reads Arbitrary Absolute File Paths (Workspace Boundary Bypass) · Advisory · siyuan-note/siyuan · GitHub
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-p23f-cm6q-2qp8Vendor Advisories for CVE-2026-82233(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 7× in last 7d / 7× 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.
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 20:41 UTCGHSA enrichment
- 2026-08-28 18:57 UTCEG score recompute
- 2026-08-28 18:57 UTCGHSA enrichment
- 2026-08-28 12:23 UTCEG score recompute
- 2026-08-28 11:24 UTCEG score recompute
- 2026-08-28 11:19 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-82233?
CVE-2026-82233 is a medium vulnerability published on August 28, 2026. SiYuan before v3.8.1 contains a path traversal vulnerability in the asset.upload MCP tool that accepts arbitrary absolute file paths without workspace boundary validation. Attackers can induce the AI Agent to upload sensitive files such as SSH keys or credentials from outside the workspace into the…
When was CVE-2026-82233 disclosed?
CVE-2026-82233 was first published in the National Vulnerability Database on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82233 actively exploited?
CVE-2026-82233 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 78.6% of all scored CVEs.
What is the CVSS score of CVE-2026-82233?
CVE-2026-82233 has a CVSS v3 base score of 5.7 (NVD).
How do I remediate CVE-2026-82233?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82233, 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
Explore the affected products and dependency analysis for CVE-2026-82233
Is Your Infrastructure Affected by CVE-2026-82233?
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