CVE-2026-51583

HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM 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(medium)
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 31, 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 23× in last 7d / 107× 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 153 total refreshes for this CVE.

  1. 2026-09-20 21:19 UTCEG score recompute
  2. 2026-09-20 21:19 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 10:27 UTCGHSA enrichment
  5. 2026-09-19 23:19 UTCEG score recompute
  6. 2026-09-19 23:19 UTCGHSA enrichment
  7. 2026-09-19 12:28 UTCGHSA enrichment
  8. 2026-09-18 22:38 UTCEG score recompute
  9. 2026-09-18 22:38 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 11:47 UTCGHSA enrichment
  12. 2026-09-18 00:56 UTCEG score recompute
  13. 2026-09-18 00:56 UTCGHSA enrichment
  14. 2026-09-17 14:04 UTCGHSA enrichment
  15. 2026-09-17 00:39 UTCEG score recompute
  16. 2026-09-17 00:39 UTCGHSA enrichment
  17. 2026-09-16 14:08 UTCEPSS rescore
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-16 02:21 UTCGHSA enrichment
  20. 2026-09-15 09:41 UTCEG score recompute
  21. 2026-09-15 09:41 UTCGHSA enrichment
  22. 2026-09-14 22:49 UTCGHSA enrichment
  23. 2026-09-14 08:02 UTCGHSA enrichment
  24. 2026-09-13 21:10 UTCEG score recompute
  25. 2026-09-13 21:10 UTCGHSA enrichment
Show 75 more
  1. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-13 10:17 UTCGHSA enrichment
  3. 2026-09-12 23:25 UTCEG score recompute
  4. 2026-09-12 23:25 UTCGHSA enrichment
  5. 2026-09-12 12:34 UTCGHSA enrichment
  6. 2026-09-12 01:43 UTCEG score recompute
  7. 2026-09-12 01:43 UTCGHSA enrichment
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-11 14:52 UTCEG score recompute
  10. 2026-09-11 14:52 UTCGHSA enrichment
  11. 2026-09-11 03:56 UTCGHSA enrichment
  12. 2026-09-10 17:04 UTCEG score recompute
  13. 2026-09-10 17:04 UTCGHSA enrichment
  14. 2026-09-10 09:35 UTCEPSS rescore
  15. 2026-09-10 05:15 UTCGHSA enrichment
  16. 2026-09-09 18:12 UTCGHSA enrichment
  17. 2026-09-09 05:49 UTCEG score recompute
  18. 2026-09-09 05:49 UTCGHSA enrichment
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-08 04:32 UTCGHSA enrichment
  21. 2026-09-07 17:10 UTCEG score recompute
  22. 2026-09-07 17:10 UTCGHSA enrichment
  23. 2026-09-07 16:01 UTCEPSS rescore
  24. 2026-09-06 22:14 UTCEG score recompute
  25. 2026-09-06 22:14 UTCGHSA enrichment
  26. 2026-09-06 13:47 UTCEPSS rescore
  27. 2026-09-06 11:17 UTCGHSA enrichment
  28. 2026-09-06 00:24 UTCEG score recompute
  29. 2026-09-06 00:24 UTCGHSA enrichment
  30. 2026-09-05 13:23 UTCGHSA enrichment
  31. 2026-09-05 01:49 UTCGHSA enrichment
  32. 2026-09-04 14:25 UTCEG score recompute
  33. 2026-09-04 14:24 UTCGHSA enrichment
  34. 2026-09-04 05:06 UTCEPSS rescore
  35. 2026-09-04 03:31 UTCGHSA enrichment
  36. 2026-09-03 16:36 UTCGHSA enrichment
  37. 2026-09-03 01:59 UTCEG score recompute
  38. 2026-09-03 01:59 UTCGHSA enrichment
  39. 2026-09-02 14:12 UTCEPSS rescore
  40. 2026-09-02 06:24 UTCGHSA enrichment
  41. 2026-09-01 17:37 UTCEG score recompute
  42. 2026-09-01 17:37 UTCGHSA enrichment
  43. 2026-09-01 13:54 UTCEPSS rescore
  44. 2026-09-01 06:45 UTCEG score recompute
  45. 2026-09-01 06:44 UTCGHSA enrichment
  46. 2026-09-01 04:40 UTCEPSS rescore
  47. 2026-08-31 19:41 UTCGHSA enrichment
  48. 2026-08-31 05:27 UTCEG score recompute
  49. 2026-08-31 05:27 UTCGHSA enrichment
  50. 2026-08-30 19:17 UTCEPSS rescore
  51. 2026-08-30 18:35 UTCGHSA enrichment
  52. 2026-08-30 07:44 UTCEG score recompute
  53. 2026-08-30 07:44 UTCGHSA enrichment
  54. 2026-08-30 01:22 UTCEPSS rescore
  55. 2026-08-29 20:52 UTCGHSA enrichment
  56. 2026-08-29 09:53 UTCEG score recompute
  57. 2026-08-29 09:52 UTCGHSA enrichment
  58. 2026-08-28 21:41 UTCEPSS rescore
  59. 2026-08-28 11:34 UTCGHSA enrichment
  60. 2026-08-27 19:41 UTCEG score recompute
  61. 2026-08-27 19:41 UTCGHSA enrichment
  62. 2026-08-27 14:25 UTCEPSS rescore
  63. 2026-08-27 08:12 UTCGHSA enrichment
  64. 2026-08-26 21:14 UTCEG score recompute
  65. 2026-08-26 21:14 UTCGHSA enrichment
  66. 2026-08-26 14:46 UTCEPSS rescore
  67. 2026-08-26 10:23 UTCGHSA enrichment
  68. 2026-08-25 23:26 UTCEG score recompute
  69. 2026-08-25 23:26 UTCGHSA enrichment
  70. 2026-08-25 13:49 UTCEPSS rescore
  71. 2026-08-25 12:34 UTCGHSA enrichment
  72. 2026-08-25 01:42 UTCGHSA enrichment
  73. 2026-08-24 14:51 UTCEG score recompute
  74. 2026-08-24 14:51 UTCGHSA enrichment
  75. 2026-08-24 03:59 UTCGHSA enrichment

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 31, 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 78.1% 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.

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