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Description

Capgo before 12.128.2 contains an authorization bypass vulnerability where write-scoped API keys can directly mutate protected channel configuration fields through PostgREST by exploiting a null authentication check in the immutability trigger. Attackers with write API keys can modify sensitive channel attributes such as public, allow_emulator, and security-related flags outside intended application routes.

PUBLISHED Reserved 2026-06-20 | Published 2026-07-10 | Updated 2026-07-10 | Assigner VulnCheck




HIGH: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Problem types

Improper Access Control

Product status

Default status
unaffected

Any version before 12.128.2
affected

12.128.2 (semver)
unaffected

Credits

Judel777 reporter

References

github.com/.../capgo/security/advisories/GHSA-ph9c-vwjq-pqhj exploit

github.com/.../capgo/security/advisories/GHSA-ph9c-vwjq-pqhj (GitHub Security Advisory (GHSA-ph9c-vwjq-pqhj)) vendor-advisory

www.vulncheck.com/...tion-mutation-via-write-scoped-api-keys (VulnCheck Advisory: Capgo - Channel Configuration Mutation via Write-Scoped API Keys) third-party-advisory

cve.org (CVE-2026-56335)

nvd.nist.gov (CVE-2026-56335)

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