CVE-2026-56100

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. The CNA's CVSS baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 3 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.1Exploit: No code on recordExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

SpringBlade versions from 2.7.3 up to but not including 5.0.0 contain a privilege escalation vulnerability that allows authenticated attackers to create system administrator accounts by sending crafted POST requests to an unprotected internal Feign user-creation endpoint exposed via @RestController without authorization checks. Attackers can exploit the gateway's authentication filter, which only validates JWT parsing without verifying user roles or caller identity, and leverage a hardcoded JWT signing key embedded in publicly available JARs to forge tokens and escalate privileges from a low-privilege user to administrator, enabling cross-tenant data pollution and persistent backdoor access.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
52
EG Risk 52/100

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 (value × EchelonGraph’s weight)
Severity81% × 45%
The EG Score, 8.1 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 28, 2026

Last Modified

October 1, 2026

Advisory Details (4)

Auto-updated Aug 28, 2026
Fix referenced — no release confirmed yet.
Web page

SpringBlade 2.7.3 < 5.0.0 Privilege Escalation via Exposed Feign Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/springblade-privilege-escalation-via-exposed-feign-endpoint
Web page

GitHub - chillzhuang/SpringBlade: SpringBlade 是一个由商业级项目升级优化而来的微服务架构，采用Spring Boot 4 、Spring Cloud 2025、Java 21 等核心技术构建，完全遵循阿里巴巴编码规范。提供基于React和Vue的两个前端框架用于快速搭建企业级的SaaS多租户微服务平台。 · GitHub

https://github.com/chillzhuang/SpringBlade
Web page

Releases · chillzhuang/SpringBlade · GitHub

https://github.com/chillzhuang/SpringBlade/releases#release-v5.0.0
Web page

CVE-2026-56100-SpringBlade-AuthBypass · GitHub

https://gist.github.com/sud0why/e73405057dd7414a8c221ef17e0d0059#file-cve-2026-56100-springblade-authbypass-en-md

Vendor Advisories for CVE-2026-56100(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 18× in last 7d / 109× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 181 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 81 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-10 12:12 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  10. 2026-10-10 00:50 UTCEG score recompute
  11. 2026-10-10 00:50 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-09 02:38 UTCEG score recompute
  14. 2026-10-09 02:38 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  15. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-08 00:51 UTCEG score recompute
  17. 2026-10-08 00:51 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-10-07 10:48 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  20. 2026-10-06 23:27 UTCEG score recompute
  21. 2026-10-06 23:27 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  22. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-06 12:07 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  24. 2026-10-06 00:47 UTCEG score recompute
  25. 2026-10-06 00:47 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
Show 75 more
  1. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-05 12:41 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  3. 2026-10-05 01:20 UTCEG score recompute
  4. 2026-10-05 01:20 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  5. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-10-04 13:22 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  7. 2026-10-04 01:54 UTCEG score recompute
  8. 2026-10-04 01:54 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  9. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-03 14:18 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  11. 2026-10-03 02:28 UTCEG score recompute
  12. 2026-10-03 02:28 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  13. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-02 15:00 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  15. 2026-10-02 03:39 UTCEG score recompute
  16. 2026-10-02 03:39 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-10-01 15:27 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  19. 2026-10-01 07:09 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  20. 2026-09-30 19:49 UTCEG score recompute
  21. 2026-09-30 19:49 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-09-30 03:49 UTCEG score recompute
  24. 2026-09-30 03:49 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  25. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  26. 2026-09-29 08:28 UTCEG score recompute
  27. 2026-09-29 08:28 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  28. 2026-09-28 21:08 UTCEG score recompute
  29. 2026-09-28 21:08 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  30. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  31. 2026-09-28 05:26 UTCEG score recompute
  32. 2026-09-28 05:26 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  33. 2026-09-27 18:06 UTCEG score recompute
  34. 2026-09-27 18:06 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  35. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  36. 2026-09-27 06:46 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  37. 2026-09-26 19:25 UTCEG score recompute
  38. 2026-09-26 19:25 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  39. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  40. 2026-09-26 08:04 UTCEG score recompute
  41. 2026-09-26 08:04 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  42. 2026-09-25 13:41 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  43. 2026-09-25 02:17 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  44. 2026-09-24 14:56 UTCEG score recompute
  45. 2026-09-24 14:56 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  46. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  47. 2026-09-24 04:19 UTCEG score recompute
  48. 2026-09-24 04:19 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  49. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  50. 2026-09-23 16:58 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  51. 2026-09-23 05:37 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  52. 2026-09-22 18:17 UTCEG score recompute
  53. 2026-09-22 18:17 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  54. 2026-09-22 06:53 UTCEG score recompute
  55. 2026-09-22 06:53 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  56. 2026-09-21 19:33 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  57. 2026-09-21 08:08 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  58. 2026-09-20 20:48 UTCEG score recompute
  59. 2026-09-20 20:48 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  60. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  61. 2026-09-20 09:28 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  62. 2026-09-19 22:07 UTCEG score recompute
  63. 2026-09-19 22:07 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  64. 2026-09-19 10:45 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  65. 2026-09-18 23:06 UTCEG score recompute
  66. 2026-09-18 23:06 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  67. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  68. 2026-09-18 11:45 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  69. 2026-09-18 00:25 UTCEG score recompute
  70. 2026-09-18 00:25 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  71. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  72. 2026-09-17 13:04 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  73. 2026-09-17 01:06 UTCEG score recompute
  74. 2026-09-17 01:06 UTCGHSA enrichmentGHSA-pmhv-3rpv-4cgh · GitHub severity HIGH · GitHub CVSS 8.1
  75. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56100?
CVE-2026-56100 is a high-severity vulnerability; its CVE record was published on August 28, 2026. SpringBlade versions from 2.7.3 up to but not including 5.0.0 contain a privilege escalation vulnerability that allows authenticated attackers to create system administrator accounts by sending crafted POST requests to an unprotected internal Feign user-creation endpoint exposed via @RestController…
When was CVE-2026-56100 made public?
CVE-2026-56100 was made public on July 30, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 28, 2026. EchelonGraph's copy of the record carries a last-modified date of October 1, 2026; the record at its source may have been updated since.
Is CVE-2026-56100 actively exploited?
CVE-2026-56100 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56100?
CVE-2026-56100 has a CVSS base score of 8.1 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-56100?
A fix for CVE-2026-56100 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-56100 are linked in the Vendor Advisories panel on this page.

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