CVE-2026-77086
⛔ criticalSummary
SiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar install and uninstall endpoints, allowing authenticated administrators to perform path traversal via directory traversal sequences. Attackers with admin access can write arbitrary files to any location via install operations or recursively delete directories via uninstall operations by supplying crafted packageName values.
CVSS Score
9.1
Critical
EPSS Score
0.7
Exploit Probability
Published Date
2026-08-21
First Seen: 2026-08-22
📊 Relative Risk Intelligence
This CVE is High Risk - more severe than 87.6% of all 348,756 vulnerabilities in our database.
#43,380
Top 25% most severe
Severity Percentile
🎯 CISA SSVC Assessment Updated: Aug 21, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
🏆 Discovered By
alham-rizvi (reporter)
SSVC data provided by
CISA
Last Modified
2026-08-21
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS Vector 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE IDs (Weakness Types)