Auth bypass in Capgo
CVE-2026-56240
Capgo before 12.128.12 contains a billing authorization bypass vulnerability in the plan_valid calculation that allows organizations with exhausted or expired usage credit grants to bypass billing gates. Attackers can exploit the divergence between the plugin hot-path plan_valid expression and the authoritative billing gate to gain continued access to /updates, /stats, /channel_self, and attachment upload endpoints after credit depletion.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Capgo — versions 0, 12.128.12
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-g9fc-82c2-p2r6 (vendor-advisory)
- www.vulncheck.com/advisories/capgo-billing-authorization-bypass-via-exhausted-u… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56240?
- CVE-2026-56240 is a medium-severity vulnerability in Capgo, classified under Improper Authorization. CVSS score: 4.3/10. Published 2026-07-11.
- How severe is CVE-2026-56240?
- Medium severity. CVSS v3 base score is 4.3 out of 10.