CVE-2026-56451

CRITICALPre-NVD 10.010.0
EchelonGraph scoreMEDIUM confidence

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

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-14. A secondary CVSS source baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
10.0EG
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).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 10.0Exploit: None knownExposed services: Not assessed

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

The CVE record's CNA (Siemens) lists Siemens Opcenter X versions before V2604 as affected. No release containing a fix is confirmed on record.

A vulnerability has been identified in Opcenter X (All versions < V2604). Affected applications do not properly validate the algorithm specified in the JSON Web Token (JWT) header. This could allow an unauthenticated remote attacker to forge arbitrary JWT, bypass authentication mechanisms and impersonate any user including administrative accounts, potentially gaining full unauthorized access to the application.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

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)
Severity100% × 45%
The EG Score, 10.0 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

July 14, 2026

Last Modified

July 15, 2026

Advisory Details (1)

Auto-updated Oct 8, 2026
No fix on record yet.
Web page

SSA-096828

https://cert-portal.siemens.com/productcert/html/ssa-096828.html

Vendor Advisories for CVE-2026-56451(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 16× in last 7d / 48× 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 361 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 261 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 01:54 UTCEG score recompute
  2. 2026-10-14 01:54 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-10-12 22:11 UTCEG score recompute
  5. 2026-10-12 22:10 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  6. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-10-12 15:54 UTCEG score recompute
  8. 2026-10-12 06:49 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  9. 2026-10-11 19:38 UTCEG score recompute
  10. 2026-10-11 16:53 UTCEG score recompute
  11. 2026-10-11 14:16 UTCEG score recompute
  12. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-10-01 13:28 UTCEG score recompute
  24. 2026-10-01 13:28 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  25. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
Show 75 more
  1. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-09-28 13:35 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  4. 2026-09-28 09:24 UTCEG score recompute
  5. 2026-09-28 09:24 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  6. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-09-24 09:56 UTCEG score recompute
  10. 2026-09-24 09:56 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  11. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-09-23 08:13 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  13. 2026-09-23 03:59 UTCEG score recompute
  14. 2026-09-23 03:59 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  15. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  16. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-09-18 10:05 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  18. 2026-09-18 04:57 UTCEG score recompute
  19. 2026-09-18 04:57 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  20. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-09-14 07:51 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  25. 2026-09-14 03:40 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  26. 2026-09-13 23:28 UTCEG score recompute
  27. 2026-09-13 23:28 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  28. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  29. 2026-09-13 16:28 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  30. 2026-09-13 12:07 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  31. 2026-09-13 07:56 UTCEG score recompute
  32. 2026-09-13 07:56 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  33. 2026-09-12 13:24 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  34. 2026-09-12 07:28 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  35. 2026-09-12 01:47 UTCEG score recompute
  36. 2026-09-12 01:47 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  37. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  38. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  39. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  40. 2026-09-08 01:49 UTCEG score recompute
  41. 2026-09-08 01:49 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  42. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  43. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  44. 2026-09-06 13:47 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  45. 2026-09-06 01:35 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  46. 2026-09-05 21:19 UTCEG score recompute
  47. 2026-09-05 21:19 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  48. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  49. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  50. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  51. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  52. 2026-08-31 05:48 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  53. 2026-08-31 00:47 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  54. 2026-08-30 20:35 UTCEG score recompute
  55. 2026-08-30 20:35 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  56. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  57. 2026-08-30 16:23 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  58. 2026-08-30 10:59 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  59. 2026-08-30 05:25 UTCEG score recompute
  60. 2026-08-30 05:25 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  61. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  62. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  63. 2026-08-28 02:29 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  64. 2026-08-27 21:34 UTCEG score recompute
  65. 2026-08-27 21:34 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  66. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  67. 2026-08-27 13:54 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  68. 2026-08-27 05:09 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  69. 2026-08-27 00:01 UTCEG score recompute
  70. 2026-08-27 00:01 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  71. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  72. 2026-08-26 12:17 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  73. 2026-08-26 07:33 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  74. 2026-08-26 01:53 UTCGHSA enrichmentGHSA-j4h7-9cc4-7f3r · GitHub severity CRITICAL · GitHub CVSS 10.0
  75. 2026-08-25 19:14 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-56451?
CVE-2026-56451 is a critical-severity vulnerability; its CVE record was published on July 14, 2026. A vulnerability has been identified in Opcenter X (All versions < V2604). Affected applications do not properly validate the algorithm specified in the JSON Web Token (JWT) header. This could allow an unauthenticated remote attacker to forge arbitrary JWT, bypass authentication mechanisms and…
When was the CVE record for CVE-2026-56451 published?
The CVE record for CVE-2026-56451 was published on July 14, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 15, 2026; the record at its source may have been updated since.
Is CVE-2026-56451 actively exploited?
CVE-2026-56451 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56451?
CVE-2026-56451 has a CVSS base score of 10.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56451?
No fix for CVE-2026-56451 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (Siemens) lists Siemens Opcenter X versions before V2604 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-56451 are linked in the Vendor Advisories panel on this page.

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