CVE-2026-56280

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 82% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

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

Cap-go before 12.128.2 contains a privilege inversion vulnerability in GET /build/logs/:jobId that allows read-only API key holders to cancel running native builds. The endpoint registers an abort listener on the SSE stream that unconditionally invokes cancelBuildOnDisconnect() using the privileged server-side BUILDER_API_KEY when clients disconnect, bypassing the app.build_native permission check required by the explicit POST /build/cancel/:jobId endpoint. Attackers with read-only API keys can repeatedly disrupt native build operations and CI/CD workflows by opening the log stream and dropping the connection.

CVSS v3
7.1
EG Score
7.1(medium)
EPSS
17.6%
KEV
Not listed

Published

June 22, 2026

Last Modified

June 24, 2026

Advisory Details (2)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Cap-go - Privilege Inversion in Build Log Stream via SSE Disconnect | Advisories | VulnCheck

https://www.vulncheck.com/advisories/cap-go-privilege-inversion-in-build-log-stream-via-sse-disconnect
github Patch Available🟡 PoC Available

Read-only API key cancels running native builds via SSE disconnect privilege inversion in /build/logs/:jobId · Advisory · Cap-go/capgo · GitHub

https://github.com/Cap-go/capgo/security/advisories/GHSA-95g7-xwwx-j737

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 88× 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.

  1. 2026-07-15 19:05 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-07-09 19:10 UTCEPSS rescore
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  63. 2026-06-23 00:00 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-56280?
CVE-2026-56280 is a high vulnerability published on June 22, 2026. Cap-go before 12.128.2 contains a privilege inversion vulnerability in GET /build/logs/:jobId that allows read-only API key holders to cancel running native builds. The endpoint registers an abort listener on the SSE stream that unconditionally invokes cancelBuildOnDisconnect() using the privileged…
When was CVE-2026-56280 disclosed?
CVE-2026-56280 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56280 actively exploited?
CVE-2026-56280 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56280?
CVE-2026-56280 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-56280?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56280, 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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