kcp is a Kubernetes-like control plane for form-factors and use-cases beyond Kubernetes and container workloads. Prior to 0.31.4 and 0.32.2, the kcp front-proxy does not remove inbound X-Remote-User, X-Remote-Group, or X-Remote-Extra-* identity headers before forwarding requests to shards. Any authenticated tenant can inject X-Remote-Group: system:masters, authorization.kcp.io/warrant, authentication.kcp.io/scopes, or a group used for per-workspace required-group gating, and the shard trusts these values as authenticated identity assertions. This allows cross-workspace impersonation, authorization bypass, and arbitrary reading, writing, or deletion of resources, secrets, RBAC data, APIExports, APIBindings, and LogicalClusters. This issue is fixed in versions 0.31.4 and 0.32.2.
CVE-2026-61682
“—” beside the score: it is equal to the CVSS score beside it.
Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-18. A secondary CVSS source baseline 9.9; sources differ by 0.0.
Also known asEUVD-2026-83043 (ENISA EUVD) · GHSA-c8w2-fgvx-vhv4 (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 9.9
- EG Score
- 9.9CRITICALmedium confidence
- EG Risk
- 45EG Risk 45/100
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)Severity99% × 45%Impact severity (EG Severity): CVSS 9.9 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.4% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (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 available. Apply it within your standard update timelines. - EPSS PROB
- 0.4%
- EPSS %ILE
- 32nd
- 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 (9.9): severity, escalated by confirmed exploitation. This CVE's 9.9 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.9 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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 or medium mission impact; Track* at high (mission-essential systems).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, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation none (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.
The score's inputs: 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
September 18, 2026
Last Modified
September 24, 2026
Advisory Details (5)
Auto-updated Oct 30, 2026kcp front-proxy does not strip inbound X-Remote-* identity headers, allowing any authenticated client to inject groups/warrants and impersonate system:masters in any workspace · Advisory · kcp-dev/kcp · GitHub
Affected: v0.31.4, 0.32.2 The front-proxy and the shard's in-process local-proxy now uncond
https://github.com/kcp-dev/kcp/security/advisories/GHSA-c8w2-fgvx-vhv4v0.32.2
Patch available: kcp-dev/kcp v0.32.2
https://github.com/kcp-dev/kcp/releases/tag/v0.32.2v0.31.4
Patch available: kcp-dev/kcp v0.31.4
https://github.com/kcp-dev/kcp/releases/tag/v0.31.4commit f913ee890fb2 (kcp-dev/kcp)
Fix landed in kcp-dev/kcp commit f913ee890fb2 — awaiting tagged release
https://github.com/kcp-dev/kcp/commit/f913ee890fb2fd9fa78e50c43474b078bfb6aeffcommit 7437cdcfec8f (kcp-dev/kcp)
Fix landed in kcp-dev/kcp commit 7437cdcfec8f — awaiting tagged release
https://github.com/kcp-dev/kcp/commit/7437cdcfec8f927d1a9bf1b2dd1e075d038e27caVendor Advisories for CVE-2026-61682(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(2)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| go | github.com/kcp-dev/kcp @ 0.31.4 (fixes < 0.31.4) | — | ghsa |
| go | github.com/kcp-dev/kcp @ 0.32.2 (fixes >= 0.32.0, < 0.32.2) | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
Go(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| github.com/kcp-dev/kcp | — |
| — |
Weakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 15× in last 7d / 65× 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.
- 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-11-01 11:57 UTCGHSA enrichmentGHSA-c8w2-fgvx-vhv4 · GitHub severity CRITICAL · GitHub CVSS 9.9
- 2026-11-01 07:41 UTCGHSA enrichmentGHSA-c8w2-fgvx-vhv4 · GitHub severity CRITICAL · GitHub CVSS 9.9
- 2026-11-01 07:41 UTCEG score recompute
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-31 10:23 UTCEG score recompute
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-30 08:49 UTCEG score recompute
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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- 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
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- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-23 18:58 UTCEG score recompute
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 31st percentile
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- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
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- 2026-10-21 15:48 UTCEG score recompute
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
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- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 30th percentile
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- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
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- 2026-10-01 20:31 UTCEG score recompute
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-30 18:02 UTCEG score recompute
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 29th percentile
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- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-27 15:46 UTCEG score recompute
- 2026-09-26 17:46 UTCEG score recompute
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-26 04:31 UTCEG score recompute
- 2026-09-24 15:24 UTCEG score recompute
- 2026-09-23 21:51 UTCEG score recompute
- 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
- 2026-09-22 19:24 UTCEG score recompute
- 2026-09-21 21:24 UTCEG score recompute
- 2026-09-21 20:59 UTCEG score recompute
- 2026-09-20 21:41 UTCEG score recompute
- 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 20th percentile
- 2026-09-19 19:12 UTCEG score recompute
- 2026-09-18 16:25 UTCEG score recompute
- 2026-09-18 16:15 UTCEG score recomputeFirst assessed: 9.9 CRITICAL
- 2026-09-18 16:14 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Same product
2 shownGo:github.com/kcp-dev/kcp
Same CWE
10 shownCWE-290 · CWE-348
Frequently asked(5)
What is CVE-2026-61682?
When was the CVE record for CVE-2026-61682 published?
Is CVE-2026-61682 actively exploited?
What is the CVSS score of CVE-2026-61682?
How do I remediate CVE-2026-61682?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-61682
Is Your Infrastructure Affected by CVE-2026-61682?
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