CVE-2026-56232

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (26th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-38739 (ENISA EUVD)Source: ENISA EUVD

8.8EG
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: 0.3%CVSS: 8.8Exploit: No code on recordExposed 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 (VulnCheck) lists Capgo versions before 12.128.2 as affected, and Capgo versions 12.128.2 as unaffected. No release containing a fix is confirmed on record.

Capgo before 12.128.2 fails to enforce limited_to_orgs and limited_to_apps constraints on subkeys provided via x-limited-key-id header in middlewareKey function. Attackers can bypass subkey scope restrictions by referencing their own subkeys, causing all downstream route handlers to use the unrestricted parent key instead of the scoped subkey.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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: No fix is confirmed yet. Restrict network exposure of the affected system within your standard update timelines at low or medium mission impact and sooner than that at high, and watch for a fix.
EPSS PROB
0.3%
EPSS %ILE
26th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.

EG Severity
8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

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

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

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

June 24, 2026

Last Modified

October 25, 2026

Advisory Details (2)

Auto-updated Jun 25, 2026
No fix on record yet. Sources: github.
GitHub advisoryMentions a patch (unverified)

MiddlewareKey x-limited-key-id subkey scope bypass: limited_to_orgs and limited_to_apps constraints are completely ignored (+ missing validateSubkeyUser cross-tenant check) · Advisory · Cap-go/capgo · GitHub

https://github.com/Cap-go/capgo/security/advisories/GHSA-2h89-vcvx-5pvh
Web page

Capgo - Subkey Scope Bypass in middlewareKey via x-limited-key-id Header | Advisories | VulnCheck

https://www.vulncheck.com/advisories/capgo-subkey-scope-bypass-in-middlewarekey-via-x-limited-key-id-header

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 38× 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 170 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 70 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  3. 2026-10-25 23:29 UTCEG score recompute
  4. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-25 14:18 UTCEG score recompute
  6. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
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  11. 2026-10-19 18:23 UTCEG score recompute
  12. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
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  14. 2026-10-18 03:29 UTCEG score recompute
  15. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
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  17. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
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  21. 2026-10-12 15:40 UTCEG score recompute
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  25. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
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  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
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  4. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
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  8. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
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  13. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
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  17. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-09-23 11:49 UTCEG score recompute
  19. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-09-18 08:14 UTCEG score recompute
  22. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 39th percentile
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  27. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  28. 2026-09-13 12:11 UTCEG score recompute
  29. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
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  38. 2026-08-30 20:21 UTCEG score recompute
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  40. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  41. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  42. 2026-08-28 04:51 UTCEG score recompute
  43. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 38th percentile
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  46. 2026-08-25 01:05 UTCEG score recompute
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  49. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  50. 2026-08-22 13:18 UTCEG score recompute
  51. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
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  59. 2026-08-17 01:55 UTCEG score recompute
  60. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 18th percentile
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  72. 2026-08-09 22:53 UTCEG score recompute
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  75. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 18th percentile

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Frequently asked(5)

What is CVE-2026-56232?
CVE-2026-56232 is a high-severity vulnerability; its CVE record was published on June 24, 2026. Capgo before 12.128.2 fails to enforce limitedtoorgs and limitedtoapps constraints on subkeys provided via x-limited-key-id header in middlewareKey function. Attackers can bypass subkey scope restrictions by referencing their own subkeys, causing all downstream route handlers to use the…
When was CVE-2026-56232 made public?
CVE-2026-56232 was made public on May 7, 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 June 24, 2026. EchelonGraph's copy of the record carries a last-modified date of October 25, 2026; the record at its source may have been updated since.
Is CVE-2026-56232 actively exploited?
CVE-2026-56232 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56232?
CVE-2026-56232 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56232?
No fix for CVE-2026-56232 is confirmed yet. Until one is published, restrict network exposure of the affected system — for example, keep it off the internet or limit it to trusted networks — and watch for a fix. The CVE record's CNA (VulnCheck) lists Capgo versions before 12.128.2 as affected, and Capgo versions 12.128.2 as unaffected. No release containing a fix is confirmed on record.

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