CVE-2026-77822Network attack vector

Sensitive-data disclosure via A2A DNS rebinding

Published Sep 4, 2026 · Updated Sep 4, 2026

Server-side request forgery in IBM ContextForge MCP Gateway 1.0.8 and earlier allows remote authenticated users to read sensitive data. The A2A invocation path validates an endpoint before use but can connect after its DNS answer changes, allowing the outbound request to reach an internal service. A user with A2A invocation access and control of the endpoint's DNS can retrieve internal or cloud metadata through the gateway.

CVSS severity8.2
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Server-side request forgery in IBM ContextForge MCP Gateway 1.0.8 and earlier allows remote authenticated users to read sensitive data. The A2A invocation path validates an endpoint before use but can connect after its DNS answer changes, allowing the outbound request to reach an internal service. A user with A2A invocation access and control of the endpoint's DNS can retrieve internal or cloud metadata through the gateway.

The record

CVE
CVE-2026-77822
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
IBM
Product
ContextForge MCP Gateway
Classifications
CWE-918, CAPEC-664, T1552.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= v1.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · ContextForge MCP Gatewayversion=<= v1.0.8

Published CVSS scores

8.2IBMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1552.005Unsecured Credentials: Cloud Instance Metadata API

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo