CVE-2026-72812

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-14. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

SiYuan versions before v3.7.4 contain a missing authorization vulnerability in the /api/ref/refreshBacklink endpoint that allows anonymous readers to trigger persistent server-side writes. Attackers can invoke the endpoint with an attacker-controlled block ID to flush transaction queues, scan all references globally, and enqueue database writes, bypassing read-only protections and enabling resource amplification attacks.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

August 14, 2026

Last Modified

August 17, 2026

Advisory Details (2)

Auto-updated Aug 14, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

SiYuan before v3.7.4 Missing Authorization via refreshBacklink | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-before-missing-authorization-via-refreshbacklink
github Patch Available🟡 PoC Available

Missing authorization on refreshBacklink allows anonymous readers to trigger persistent server-side writes and unauthenticated resource amplification (publish mode) · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wgwx-479j-23vq

Vendor Advisories for CVE-2026-72812(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 25× in last 7d / 25× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 14:03 UTCEG score recompute
  3. 2026-08-20 14:03 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 14:35 UTCGHSA enrichment
  6. 2026-08-18 15:36 UTCEG score recompute
  7. 2026-08-18 15:36 UTCGHSA enrichment
  8. 2026-08-18 13:49 UTCEPSS rescore
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-17 16:25 UTCEG score recompute
  11. 2026-08-17 16:25 UTCGHSA enrichment
  12. 2026-08-17 14:01 UTCEG score recompute
  13. 2026-08-17 14:01 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-16 15:03 UTCEG score recompute
  16. 2026-08-16 15:03 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 02:15 UTCEPSS rescore
  20. 2026-08-15 16:05 UTCGHSA enrichment
  21. 2026-08-14 17:07 UTCEG score recompute
  22. 2026-08-14 17:06 UTCGHSA enrichment
  23. 2026-08-14 12:22 UTCEG score recompute
  24. 2026-08-14 11:49 UTCEG score recompute
  25. 2026-08-14 11:49 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-72812?
CVE-2026-72812 is a medium vulnerability published on August 14, 2026. SiYuan versions before v3.7.4 contain a missing authorization vulnerability in the /api/ref/refreshBacklink endpoint that allows anonymous readers to trigger persistent server-side writes. Attackers can invoke the endpoint with an attacker-controlled block ID to flush transaction queues, scan all…
When was CVE-2026-72812 disclosed?
CVE-2026-72812 was first published in the National Vulnerability Database on August 14, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72812 actively exploited?
CVE-2026-72812 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 80.0% of all scored CVEs.
What is the CVSS score of CVE-2026-72812?
CVE-2026-72812 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-72812?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72812, 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-2026-72812

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