Auth bypass in Capgo
CVE-2026-56249
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L.
EPSS exploit prediction
EPSS: 0.004 (27.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Capgo — versions 0, 12.128.2
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-vj24-j594-3wv3 (vendor-advisory)
- www.vulncheck.com/advisories/capgo-unauthorized-channel-overwrite-and-ownership… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56249?
- CVE-2026-56249 is a high-severity vulnerability in Capgo, classified under Improper Authorization. CVSS score: 7.6/10. Published 2026-06-30.
- How severe is CVE-2026-56249?
- High severity. CVSS v3 base score is 7.6 out of 10.