CVE-2026-55570

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 53% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.0Exploit: None knownExposed: 0

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

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, it does not escape the untrusted fields (name, version, author, description) when they are serialized into the data-obj HTML attribute of each marketplace card. Because the attribute is single-quoted and the value is produced with JSON.stringify() (which does not escape ', <, or >), a package whose name contains a single quote breaks out of the attribute and injects arbitrary HTML. In the desktop client the main BrowserWindow runs with nodeIntegration: true, contextIsolation: false, so the injected markup escalates from DOM XSS to arbitrary OS command execution. This is the same root cause and same impact as the original advisory, reached through a sibling sink the patch did not cover. This vulnerability is fixed in 3.7.0.

CVSS v3
9.0
EG Score
9.0(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity90% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Stored XSS results to Electron RCE in SiYuan marketplace via unescaped `data-obj` attribute (incomplete fix for GHSA-27qc-m5gf-jv5r) / Bypass for CVE-2026-45375's patch · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-x88j-wgpr-h22x

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 53× 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.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 21:53 UTCEG score recompute
  3. 2026-08-24 13:18 UTCEG score recompute
  4. 2026-08-23 02:26 UTCEG score recompute
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  13. 2026-08-18 13:48 UTCEPSS rescore
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  1. 2026-08-11 17:29 UTCEG score recompute
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  4. 2026-08-09 15:53 UTCEG score recompute
  5. 2026-08-09 13:46 UTCEPSS rescore
  6. 2026-08-08 17:11 UTCEG score recompute
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  8. 2026-08-07 18:28 UTCEG score recompute
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  10. 2026-08-06 13:47 UTCEPSS rescore
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  22. 2026-07-30 16:28 UTCEPSS rescore
  23. 2026-07-30 09:53 UTCEG score recompute
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  25. 2026-07-30 01:30 UTCEPSS rescore
  26. 2026-07-29 00:38 UTCEG score recompute
  27. 2026-07-28 15:37 UTCEPSS rescore
  28. 2026-07-27 17:31 UTCEG score recompute
  29. 2026-07-26 15:20 UTCEG score recompute
  30. 2026-07-26 14:54 UTCEPSS rescore
  31. 2026-07-25 14:18 UTCEPSS rescore
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  34. 2026-07-23 03:20 UTCEG score recompute
  35. 2026-07-22 14:08 UTCEPSS rescore
  36. 2026-07-21 15:25 UTCEPSS rescore
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  38. 2026-07-19 14:31 UTCEPSS rescore
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  40. 2026-07-19 02:29 UTCEPSS rescore
  41. 2026-07-18 10:04 UTCEPSS rescore
  42. 2026-07-16 17:03 UTCEPSS rescore
  43. 2026-07-15 16:57 UTCEPSS rescore
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  45. 2026-07-15 02:00 UTCEPSS rescore
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  47. 2026-07-13 22:31 UTCEPSS rescore
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  50. 2026-07-12 05:46 UTCEPSS rescore
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  53. 2026-07-09 19:10 UTCEPSS rescore
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  55. 2026-07-08 15:16 UTCEPSS rescore
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  57. 2026-07-07 13:46 UTCEPSS rescore
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  59. 2026-07-06 16:27 UTCEPSS rescore
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  67. 2026-07-01 15:07 UTCEPSS rescore
  68. 2026-06-30 23:22 UTCEPSS rescore
  69. 2026-06-29 14:06 UTCEPSS rescore
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  71. 2026-06-28 14:07 UTCEPSS rescore
  72. 2026-06-28 04:56 UTCEPSS rescore
  73. 2026-06-28 04:56 UTCEPSS rescore
  74. 2026-06-27 03:08 UTCEPSS rescore
  75. 2026-06-25 13:49 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-55570?
CVE-2026-55570 is a critical vulnerability published on June 24, 2026. SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, it does not escape the untrusted fields (name, version, author, description) when they are serialized into the data-obj HTML attribute of each marketplace card. Because the attribute is single-quoted and the value is…
When was CVE-2026-55570 disclosed?
CVE-2026-55570 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55570 actively exploited?
CVE-2026-55570 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.1% of all scored CVEs.
What is the CVSS score of CVE-2026-55570?
CVE-2026-55570 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2026-55570?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55570, 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.

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