Capgo before 12.128.2 contains an authorization bypass vulnerability in the channel creation endpoint that allows authenticated users to overwrite existing channels by reusing their names. Attackers with app.create_channel permission can exploit a logic mismatch between existence validation and upsert operations to reassign channel ownership and modify critical production channel configurations.
CVE-2026-56249
HIGHPre-NVD 7.67.6—
EchelonGraph scoreHIGH confidence
Score 7.6 from GitHub Security Advisory (severity: HIGH) published 2026-07-01. a secondary CVSS source baseline 7.6; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.6Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.6
- EG Score
- 7.6(high)
- EPSS
- 17.1%
- KEV
- Not listed
Published
July 1, 2026
Last Modified
July 1, 2026
Advisory Details (2)
Auto-updated Jul 3, 2026🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available
Unauthorized channel overwrite and ownership takeover via POST /channel name collision · Advisory · Cap-go/capgo · GitHub
https://github.com/Cap-go/capgo/security/advisories/GHSA-vj24-j594-3wv3generic
Capgo - Unauthorized Channel Overwrite and Ownership Takeover via POST /channel Name Collision | Advisories | VulnCheck
https://www.vulncheck.com/advisories/capgo-unauthorized-channel-overwrite-and-ownership-takeover-via-post-channel-name-collisionVendor Advisories for CVE-2026-56249(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Frequently asked(5)
What is CVE-2026-56249?
CVE-2026-56249 is a high vulnerability published on July 1, 2026. Capgo before 12.128.2 contains an authorization bypass vulnerability in the channel creation endpoint that allows authenticated users to overwrite existing channels by reusing their names. Attackers with app.create_channel permission can exploit a logic mismatch between existence validation and…
When was CVE-2026-56249 disclosed?
CVE-2026-56249 was first published in the National Vulnerability Database on July 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56249 actively exploited?
CVE-2026-56249 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56249?
CVE-2026-56249 has a CVSS v3 base score of 7.6 (NVD).
How do I remediate CVE-2026-56249?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56249, 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.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-56249
Is Your Infrastructure Affected by CVE-2026-56249?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.