CVE-2026-56323

Capgo - Unauthenticated Channel Enumeration and App Oracle via GET /channel_self

Published Jun 22, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Description

Capgo before 12.128.2 contains an information disclosure vulnerability in the /functions/v1/channel_self endpoint that allows unauthenticated attackers to enumerate non-public channel names and determine app existence and subscription status. Remote attackers can send GET requests with arbitrary app_id parameters to disclose internal rollout channels, enumerate valid applications across tenants, and leak billing status without authentication or device binding.

Analysis

Technical impact

Capgo version prior to 12.128.2 exposes an information disclosure flaw in the /functions/v1/channel_self endpoint. Unauthenticated attackers can send arbitrary GET requests with an app_id parameter to enumerate internal rollout channels, identify valid applications across tenants, and expose billing status. The weakness is a classic information disclosure vulnerability (CWE-200) that allows compromise of confidentiality without any authentication or device binding, potentially revealing sensitive deployment data to remote actors.

Affected Systems

Vulnerable systems are Capgo deployments using the Capgo product. No specific version numbers are provided in the source data, but the issue exists in all releases prior to 12.128.2.

Risk and Exploitability

The CVSS score of 8.7 indicates a high severity. The EPSS score is not available, and the vulnerability is not listed in the CISA KEV catalog. Attackers can exploit this remotely through unauthenticated HTTP GET requests, making it practical for automated enumeration of channel names and application visibility.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Capgo

unaffected

Version	Status	Constraints
`0`	affected	< 12.128.2
`12.128.2`	unaffected	—

No data.

Vendor Product Versions

Cap-go

Version	Status	Scheme	Platform
`[0,12.128.2)`	affected	semver	—
`12.128.2`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Update Capgo to version 12.128.2 or later to eliminate the exposure.
Configure the API gateway or web server to require authentication for the /functions/v1/channel_self endpoint, or block access from untrusted networks.
Apply network segmentation and firewall rules to restrict access to Capgo control plane endpoints to trusted administrators only.

Generated by OpenCVE AI on June 22, 2026 at 23:36 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.638% probability within 30 days)

Exploitation poc

Automatable yes

Technical Impact partial

References

Link	Providers
https://github.com/Cap-go/capgo/security/advisories/GHSA-469v-6vw5-hxpq
https://www.vulncheck.com/advisories/capgo-unauthenticated-channel-enumeration-and-app-oracle-via-get-channel-self

History

Jun 24, 2026 4:45 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cap-go Cap-go cap-go
Vendors & Products		Cap-go Cap-go cap-go

Jun 23, 2026 3:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jun 22, 2026 10:00 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Capgo before 12.128.2 contains an information disclosure vulnerability in the /functions/v1/channel_self endpoint that allows unauthenticated attackers to enumerate non-public channel names and determine app existence and subscription status. Remote attackers can send GET requests with arbitrary app_id parameters to disclose internal rollout channels, enumerate valid applications across tenants, and leak billing status without authentication or device binding.
Title		Capgo - Unauthenticated Channel Enumeration and App Oracle via GET /channel_self
Weaknesses		CWE-200
References		https://github.com/Cap-go/capgo/security/advisories/GHSA-469v-6vw5-hxpq https://www.vulncheck.com/advisories/capgo-unauthenticated-channel-enumeration-and-app-oracle-via-get-channel-self
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}` cvssV4_0 `{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}`