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Capgo CVE-2026-56282

| EUVDEUVD-2026-38120 MEDIUM
Information Exposure (CWE-200)
2026-06-20 VulnCheck GHSA-6fvp-3fgp-7pvf
Information Disclosure PostgreSQL Capgo
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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
vuln.today AI
5.3 MEDIUM

Network-reachable unauthenticated endpoint with no complexity, leaking only internal PostgreSQL replication metadata - low confidentiality impact, no integrity or availability impact, scope unchanged.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jun 22, 2026 - 06:19 vuln.today
Patch available
Jun 20, 2026 - 17:16 EUVD

DescriptionCVE.org

Capgo before 12.128.2 contains an information disclosure vulnerability in the unauthenticated /replication endpoint that exposes internal PostgreSQL replication telemetry including slot names and WAL LSN positions. Attackers can access this endpoint without authentication to retrieve sensitive infrastructure details such as replication slot names, confirmed_flush_lsn, restart_lsn values, and database error messages for reconnaissance purposes.

AnalysisAI

Unauthenticated access to Capgo's /replication HTTP endpoint exposes internal PostgreSQL replication telemetry to any remote attacker, affecting all versions prior to 12.128.2. Attackers can retrieve replication slot names, WAL LSN positions (confirmed_flush_lsn, restart_lsn), and database error messages without supplying any credentials, enabling database infrastructure reconnaissance. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify internet-exposed Capgo HTTP service
Exploit
Send unauthenticated GET request to /replication endpoint
Execution
Parse response for slot names, WAL LSN values, and error messages
Impact
Map PostgreSQL replication topology for downstream targeting
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Vulnerability AssessmentAI

Exploitation No special conditions are required - the /replication endpoint accepts unauthenticated HTTP requests in all default configurations of Capgo versions before 12.128.2. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N) correctly characterizes this as a network-accessible, zero-complexity, unauthenticated information disclosure with low confidentiality impact to the vulnerable system and no integrity or availability consequences. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker performing reconnaissance against internet-facing infrastructure identifies a publicly reachable Capgo instance and issues an unauthenticated HTTP GET request to the /replication endpoint. The server responds with JSON containing PostgreSQL replication slot names, current WAL LSN positions, and any recent database error messages, allowing the attacker to map the replication topology, identify standby nodes, and estimate data volume for use in planning deeper attacks against the database infrastructure. …
Remediation Upgrade Capgo to version 12.128.2 or later, which is the vendor-released patch per the GitHub Security Advisory GHSA-q6gm-xfwr-44f5 (https://github.com/Cap-go/capgo/security/advisories/GHSA-q6gm-xfwr-44f5). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-56282 vulnerability details – vuln.today
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