CVE-2026-74902

HIGHPre-NVD 8.68.6—
EchelonGraph scoreHIGH confidence

Score 8.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: None knownExposed: 0

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

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.

CVSS v3
8.6
EG Score
8.6(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity86% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 18, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
Patch available. Sources: github.
generic

SiYuan before v3.7.4 XSS-to-RCE via malicious filename upload | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-xss-to-rce-via-malicious-filename-upload
github Patch Available

XSS-to-RCE via malicious filename in the upload/drag-drop validation flow (app/src/protyle/upload/index.ts), reflected unescaped into showMessage's insertAdjacentHTML sink · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-jf56-jrhq-j2qp

Vendor Advisories for CVE-2026-74902(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 17× in last 7d / 17× 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. 2026-08-21 05:39 UTCEG score recompute
  2. 2026-08-21 05:39 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 17:04 UTCGHSA enrichment
  5. 2026-08-20 04:30 UTCEG score recompute
  6. 2026-08-20 04:30 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 15:56 UTCGHSA enrichment
  9. 2026-08-19 03:22 UTCGHSA enrichment
  10. 2026-08-18 14:47 UTCEG score recompute
  11. 2026-08-18 14:47 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEG score recompute
  13. 2026-08-18 13:48 UTCGHSA enrichment
  14. 2026-08-18 12:37 UTCEG score recompute
  15. 2026-08-18 12:36 UTCGHSA enrichment
  16. 2026-08-18 11:29 UTCEG score recompute
  17. 2026-08-18 11:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-74902?
CVE-2026-74902 is a high vulnerability published on August 18, 2026. 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 was CVE-2026-74902 disclosed?
CVE-2026-74902 was first published in the National Vulnerability Database on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74902 actively exploited?
CVE-2026-74902 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 95.5% of all scored CVEs.
What is the CVSS score of CVE-2026-74902?
CVE-2026-74902 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-74902?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74902, 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-2026-74902

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