EUVD-2026-42886
GHSA-648m-f972-jcc9
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Requires a write-scoped API key so PR:L; network-reachable PostgREST with low complexity gives AV:N/AC:L; impact is integrity-only (I:H), no read or availability effect.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Improper access control in Capgo before 12.128.2 lets holders of write-scoped API keys directly mutate protected channel configuration fields (such as public, allow_emulator, and security-related flags) through the PostgREST data layer, bypassing intended application route restrictions. The flaw stems from a null authentication check in the database immutability trigger, allowing a low-privileged but authenticated actor to alter integrity-sensitive delivery settings for a Capacitor live-update backend. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to possess a valid write-scoped Capgo API key and network access to the Capgo PostgREST endpoint; with those, they issue direct mutations against protected channel configuration fields (public, allow_emulator, and security-related flags), bypassing the application routes that normally guard them. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) scores 7.1 and isolates the impact entirely to integrity (VI:H, with VC:N and VA:N) - consistent with the description: an attacker cannot read secrets or take the service down, but can silently tamper with channel delivery settings. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained a write-scoped Capgo API key (for example a leaked CI secret or an over-privileged integration token) sends a crafted PostgREST request directly against the channel configuration table. Because the immutability trigger fails open on a null auth context, the request succeeds and the attacker flips a channel to public or enables allow_emulator, weakening delivery controls without ever touching the intended application routes. … |
| Remediation | Upgrade to Capgo 12.128.2 or later, which corrects the null authentication check in the immutability trigger - Vendor-released patch: 12.128.2, per advisory GHSA-ph9c-vwjq-pqhj (https://github.com/Cap-go/capgo/security/advisories/GHSA-ph9c-vwjq-pqhj). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit all active write-scoped API keys in your Capgo account and document which applications and services hold these credentials; review recent channel configuration change logs for unauthorized modifications. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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