CVE-2026-51583

HIGHPre-NVD 8.58.5—
EchelonGraph scoreHIGH confidence

Score 8.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
8.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.5Exploit: Elevated riskExposed: 0

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

An issue in usememos through v0.30.0 allows a remote authenticated attacker to perform Server-Side Request Forgery (SSRF) via the Webhook validation mechanism in internal/webhook/validate.go, by setting a webhook target to an internal address.

CVSS v3
8.5
EG Score
8.5(high)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity85% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Aug 12, 2026
🔬 Proof of concept available. Patch available.
generic Patch Available🟡 PoC Available

CVE-2026-51583 · GitHub

https://gist.github.com/seiyaibuki0523/d8af15eb555808319a2633269a9ebb80
generic

GitHub - usememos/memos: Open-source, self-hosted note-taking tool built for quick capture. Markdown-native, lightweight, and fully yours. · GitHub

https://github.com/usememos/memos

Vendor Advisories for CVE-2026-51583(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 29× in last 7d / 43× 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 23:59 UTCEG score recompute
  2. 2026-08-20 23:59 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 13:08 UTCGHSA enrichment
  5. 2026-08-20 02:12 UTCEG score recompute
  6. 2026-08-20 02:12 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 15:20 UTCGHSA enrichment
  9. 2026-08-19 04:15 UTCGHSA enrichment
  10. 2026-08-18 17:24 UTCEG score recompute
  11. 2026-08-18 17:24 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 06:09 UTCGHSA enrichment
  14. 2026-08-17 19:17 UTCEG score recompute
  15. 2026-08-17 19:17 UTCGHSA enrichment
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 07:55 UTCGHSA enrichment
  18. 2026-08-16 21:04 UTCEG score recompute
  19. 2026-08-16 21:04 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 10:13 UTCEG score recompute
  22. 2026-08-16 10:13 UTCGHSA enrichment
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 23:22 UTCGHSA enrichment
  25. 2026-08-15 12:31 UTCGHSA enrichment
Show 18 more
  1. 2026-08-15 01:39 UTCEG score recompute
  2. 2026-08-15 01:39 UTCGHSA enrichment
  3. 2026-08-15 01:30 UTCEPSS rescore
  4. 2026-08-14 14:48 UTCGHSA enrichment
  5. 2026-08-14 03:56 UTCEG score recompute
  6. 2026-08-14 03:56 UTCGHSA enrichment
  7. 2026-08-13 22:00 UTCEPSS rescore
  8. 2026-08-13 17:05 UTCGHSA enrichment
  9. 2026-08-13 06:11 UTCEG score recompute
  10. 2026-08-13 06:11 UTCGHSA enrichment
  11. 2026-08-12 19:19 UTCGHSA enrichment
  12. 2026-08-12 18:31 UTCEG score recompute▲ 8.50
  13. 2026-08-12 18:31 UTCGHSA enrichment
  14. 2026-08-12 18:30 UTCMITRE cvelistV5CVSS v3 → 8.5 · severity → HIGH
  15. 2026-08-12 13:51 UTCEPSS rescore
  16. 2026-08-11 14:24 UTCNVD update
  17. 2026-08-11 14:04 UTCEG score recompute
  18. 2026-08-11 14:02 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-51583?
CVE-2026-51583 is a high vulnerability published on August 11, 2026. An issue in usememos through v0.30.0 allows a remote authenticated attacker to perform Server-Side Request Forgery (SSRF) via the Webhook validation mechanism in internal/webhook/validate.go, by setting a webhook target to an internal address.
When was CVE-2026-51583 disclosed?
CVE-2026-51583 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-51583 actively exploited?
CVE-2026-51583 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 78.3% of all scored CVEs.
What is the CVSS score of CVE-2026-51583?
CVE-2026-51583 has a CVSS v3.1 base score of 8.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-51583?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-51583, 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-2026-51583

Explore →

Is Your Infrastructure Affected by CVE-2026-51583?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs