CVE-2026-82654

HIGHPre-NVD 8.98.9—
EchelonGraph scoreHIGH confidence

Score 8.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-30. a secondary CVSS source baseline 8.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.9Exploit: None knownExposed: 0

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

SiYuan before v3.8.1 fails to properly escape block name, alias, and memo fields in hint, backlink, and breadcrumb rendering functions. Attackers can set a block's name to contain HTML/script tags that execute when another user views documents referencing or displaying that block.

CVSS v3
8.9
EG Score
8.9(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity89% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

August 30, 2026

Last Modified

September 1, 2026

Advisory Details (2)

Auto-updated Aug 30, 2026
Patch available. Sources: github.
generic

SiYuan before v3.8.1 Stored XSS via block name | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-3.8.1-stored-xss-via-block-name
github Patch Available

Stored HTML/script injection via block name in hint, backlink, and breadcrumb rendering (regression of a prior fix, plus two unpatched sibling instances) · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hf87-qh3j-3p88

Vendor Advisories for CVE-2026-82654(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 26× in last 7d / 98× 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. 2026-09-25 03:20 UTCGHSA enrichment
  2. 2026-09-24 14:29 UTCEG score recompute
  3. 2026-09-24 14:29 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 01:19 UTCEG score recompute
  6. 2026-09-24 01:19 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 12:29 UTCGHSA enrichment
  9. 2026-09-22 23:39 UTCEG score recompute
  10. 2026-09-22 23:39 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 10:43 UTCGHSA enrichment
  13. 2026-09-21 21:52 UTCEG score recompute
  14. 2026-09-21 21:52 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 09:02 UTCEG score recompute
  17. 2026-09-21 09:02 UTCGHSA enrichment
  18. 2026-09-20 20:16 UTCEPSS rescore
  19. 2026-09-20 20:11 UTCGHSA enrichment
  20. 2026-09-20 07:20 UTCGHSA enrichment
  21. 2026-09-19 18:03 UTCEG score recompute
  22. 2026-09-19 18:03 UTCGHSA enrichment
  23. 2026-09-19 05:11 UTCEG score recompute
  24. 2026-09-19 05:10 UTCGHSA enrichment
  25. 2026-09-18 19:28 UTCEPSS rescore
Show 73 more
  1. 2026-09-18 16:19 UTCGHSA enrichment
  2. 2026-09-18 02:51 UTCEG score recompute
  3. 2026-09-18 02:51 UTCGHSA enrichment
  4. 2026-09-17 14:00 UTCGHSA enrichment
  5. 2026-09-17 01:09 UTCEG score recompute
  6. 2026-09-17 01:09 UTCGHSA enrichment
  7. 2026-09-16 14:08 UTCEPSS rescore
  8. 2026-09-16 12:18 UTCEG score recompute
  9. 2026-09-16 12:18 UTCGHSA enrichment
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 23:28 UTCGHSA enrichment
  12. 2026-09-15 10:06 UTCEG score recompute
  13. 2026-09-15 10:06 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 21:12 UTCGHSA enrichment
  17. 2026-09-14 08:06 UTCGHSA enrichment
  18. 2026-09-13 19:15 UTCEG score recompute
  19. 2026-09-13 19:15 UTCGHSA enrichment
  20. 2026-09-13 06:24 UTCGHSA enrichment
  21. 2026-09-12 17:34 UTCEG score recompute
  22. 2026-09-12 17:34 UTCGHSA enrichment
  23. 2026-09-12 04:42 UTCGHSA enrichment
  24. 2026-09-11 15:51 UTCEG score recompute
  25. 2026-09-11 15:51 UTCGHSA enrichment
  26. 2026-09-11 14:53 UTCEPSS rescore
  27. 2026-09-11 14:53 UTCEPSS rescore
  28. 2026-09-11 03:00 UTCGHSA enrichment
  29. 2026-09-10 14:09 UTCEG score recompute
  30. 2026-09-10 14:09 UTCGHSA enrichment
  31. 2026-09-10 01:18 UTCGHSA enrichment
  32. 2026-09-09 12:27 UTCGHSA enrichment
  33. 2026-09-08 23:36 UTCEG score recompute
  34. 2026-09-08 23:36 UTCGHSA enrichment
  35. 2026-09-08 22:01 UTCEPSS rescore
  36. 2026-09-08 05:04 UTCGHSA enrichment
  37. 2026-09-07 16:13 UTCEG score recompute
  38. 2026-09-07 16:13 UTCGHSA enrichment
  39. 2026-09-07 03:23 UTCGHSA enrichment
  40. 2026-09-06 14:27 UTCEG score recompute
  41. 2026-09-06 14:27 UTCGHSA enrichment
  42. 2026-09-06 13:48 UTCEPSS rescore
  43. 2026-09-06 01:37 UTCEG score recompute
  44. 2026-09-06 01:37 UTCGHSA enrichment
  45. 2026-09-05 15:31 UTCEPSS rescore
  46. 2026-09-05 12:47 UTCGHSA enrichment
  47. 2026-09-04 23:54 UTCEG score recompute
  48. 2026-09-04 23:54 UTCGHSA enrichment
  49. 2026-09-04 11:04 UTCEG score recompute
  50. 2026-09-04 11:04 UTCGHSA enrichment
  51. 2026-09-04 05:07 UTCEPSS rescore
  52. 2026-09-03 22:10 UTCGHSA enrichment
  53. 2026-09-03 09:03 UTCGHSA enrichment
  54. 2026-09-02 20:13 UTCEG score recompute
  55. 2026-09-02 20:13 UTCGHSA enrichment
  56. 2026-09-02 14:12 UTCEPSS rescore
  57. 2026-09-02 04:50 UTCGHSA enrichment
  58. 2026-09-01 15:57 UTCEG score recompute
  59. 2026-09-01 15:56 UTCGHSA enrichment
  60. 2026-09-01 14:30 UTCEG score recompute
  61. 2026-09-01 14:29 UTCGHSA enrichment
  62. 2026-09-01 13:54 UTCEPSS rescore
  63. 2026-09-01 10:01 UTCEG score recompute
  64. 2026-09-01 10:01 UTCGHSA enrichment
  65. 2026-09-01 04:40 UTCEPSS rescore
  66. 2026-09-01 04:40 UTCEPSS rescore
  67. 2026-08-31 21:08 UTCGHSA enrichment
  68. 2026-08-31 17:07 UTCGHSA enrichment
  69. 2026-08-31 04:11 UTCEG score recompute
  70. 2026-08-31 04:10 UTCGHSA enrichment
  71. 2026-08-30 15:18 UTCEG score recompute
  72. 2026-08-30 14:37 UTCEG score recompute
  73. 2026-08-30 14:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82654?
CVE-2026-82654 is a high vulnerability published on August 30, 2026. SiYuan before v3.8.1 fails to properly escape block name, alias, and memo fields in hint, backlink, and breadcrumb rendering functions. Attackers can set a block's name to contain HTML/script tags that execute when another user views documents referencing or displaying that block.
When was CVE-2026-82654 disclosed?
CVE-2026-82654 was first published in the National Vulnerability Database on August 30, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82654 actively exploited?
CVE-2026-82654 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 72.3% of all scored CVEs.
What is the CVSS score of CVE-2026-82654?
CVE-2026-82654 has a CVSS v3 base score of 8.9 (NVD).
How do I remediate CVE-2026-82654?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82654, 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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