Dashboard / CVE-2026-74902

CVE-2026-74902

CRITICAL
INFO Priority: 0.02 BB Relevance: 44/100
Published: 2026-08-18 Modified: 2026-10-22 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Auth Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Local
AC: Low
PR: None
UI: Passive
S: X
AT: None
VC: High
VI: High
VA: High

Description

SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file upload validation flow that fails to escape filenames before inserting them into HTML via insertAdjacentHTML. Attackers can craft a malicious filename containing script payloads that execute with full OS command access when a user drags, drops, or pastes the file into the editor.

Weakness Classification (1)

References & Advisories (2)

Bug Bounty Relevance

44 / 100
✓ No authentication
✓ Low complexity

CVSS Score

9.3 / 10.0 v4.0
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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

EPSS — Exploitation Probability

0.20%
Raw Score 0.001980
Percentile 9.6%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00198
2026-10-28
0.00198

Intelligence Sources

nvd ref →

External Links