CVE-2026-87812

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreHIGH confidence

Score 6.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. a secondary CVSS source baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

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

SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in Bazaar package cards where the iconURL metadata is inserted directly into HTML img src attributes without escaping. Attackers can inject malicious URLs with event handlers that execute JavaScript in the authenticated SiYuan origin when users view Bazaar listings, enabling API requests and application state manipulation.

CVSS v3
6.8
EG Score
6.8(high)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 9, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

SiYuan before v3.8.2 Stored XSS via Bazaar iconURL | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-bazaar-iconurl
github Patch Available🟡 PoC Available

Stored XSS in Bazaar package cards via unescaped iconURL metadata · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-rvcf-q4h8-w6c9

Vendor Advisories for CVE-2026-87812(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 20× in last 7d / 51× 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. 2026-09-24 22:13 UTCEG score recompute
  2. 2026-09-24 22:13 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 23:24 UTCEG score recompute
  5. 2026-09-23 23:24 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 00:36 UTCEG score recompute
  8. 2026-09-23 00:36 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 01:47 UTCEG score recompute
  11. 2026-09-22 01:47 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 02:59 UTCEG score recompute
  14. 2026-09-21 02:58 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 04:09 UTCEG score recompute
  17. 2026-09-20 04:09 UTCGHSA enrichment
  18. 2026-09-19 05:20 UTCEG score recompute
  19. 2026-09-19 05:20 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 06:32 UTCEG score recompute
  22. 2026-09-18 06:32 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-17 07:43 UTCEG score recompute
  25. 2026-09-17 07:43 UTCGHSA enrichment
Show 26 more
  1. 2026-09-16 14:09 UTCEPSS rescore
  2. 2026-09-16 08:54 UTCEG score recompute
  3. 2026-09-16 08:54 UTCGHSA enrichment
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-15 09:27 UTCEG score recompute
  6. 2026-09-15 09:27 UTCGHSA enrichment
  7. 2026-09-15 03:12 UTCEPSS rescore
  8. 2026-09-14 10:38 UTCEG score recompute
  9. 2026-09-14 10:38 UTCGHSA enrichment
  10. 2026-09-13 11:49 UTCEG score recompute
  11. 2026-09-13 11:49 UTCGHSA enrichment
  12. 2026-09-12 13:00 UTCEG score recompute
  13. 2026-09-12 13:00 UTCGHSA enrichment
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:11 UTCEG score recompute
  17. 2026-09-11 14:11 UTCGHSA enrichment
  18. 2026-09-10 15:22 UTCEG score recompute
  19. 2026-09-10 15:22 UTCGHSA enrichment
  20. 2026-09-10 15:00 UTCEG score recompute
  21. 2026-09-10 15:00 UTCGHSA enrichment
  22. 2026-09-09 20:45 UTCEG score recompute
  23. 2026-09-09 20:45 UTCGHSA enrichment
  24. 2026-09-09 12:25 UTCEG score recompute
  25. 2026-09-09 11:30 UTCEG score recompute
  26. 2026-09-09 11:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87812?
CVE-2026-87812 is a medium vulnerability published on September 9, 2026. SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in Bazaar package cards where the iconURL metadata is inserted directly into HTML img src attributes without escaping. Attackers can inject malicious URLs with event handlers that execute JavaScript in the authenticated…
When was CVE-2026-87812 disclosed?
CVE-2026-87812 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87812 actively exploited?
CVE-2026-87812 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 72.8% of all scored CVEs.
What is the CVSS score of CVE-2026-87812?
CVE-2026-87812 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-87812?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87812, 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

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