CVE-2026-76760: cc-connect RCE Vulnerability

CVE-2026-76760 Overview

CVE-2026-76760 is a code injection vulnerability affecting chenhg5 cc-connect versions up to 1.4.1. The flaw resides in the Authenticate function within core/webhook.go, where the exec argument is not properly sanitized before use. Remote attackers can supply crafted input to trigger code injection over the network without authentication. The exploit has been publicly disclosed, increasing the likelihood of opportunistic scanning and abuse. The underlying weakness is classified as improper neutralization of special elements in output used by a downstream component [CWE-74]. The associated GitHub issue tracking the report was closed automatically due to inactivity, and no vendor patch has been referenced in the advisory.

Critical Impact
Unauthenticated remote attackers can inject code via the exec parameter processed by the Authenticate webhook handler, leading to compromise of application confidentiality, integrity, and availability.

Affected Products

chenhg5 cc-connect versions up to and including 1.4.1
Deployments exposing the core/webhook.goAuthenticate endpoint to untrusted networks
Downstream forks or integrations that reuse the vulnerable webhook handler

Discovery Timeline

2026-08-19 - CVE-2026-76760 published to the National Vulnerability Database (NVD)
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-76760

Vulnerability Analysis

The vulnerability lives in the Authenticate function inside core/webhook.go of the cc-connect project. This function processes an exec argument supplied by the caller and passes it to a downstream component without adequate neutralization. An attacker can craft the exec value to embed executable directives that alter the application's control flow. Because the webhook endpoint is reachable over the network and requires no prior authentication, exploitation can be launched remotely by any client capable of sending HTTP requests to the service. Publicly available exploit details lower the barrier for attackers who may weaponize the flaw against exposed instances.

Root Cause

The root cause is improper input neutralization [CWE-74] within the Authenticate handler. The exec argument is treated as trusted data and forwarded to code that interprets it as executable content, rather than being validated, encoded, or restricted to a known allowlist of values.

Attack Vector

Exploitation occurs over the network by issuing a webhook request that includes a malicious exec parameter. No user interaction and no credentials are required, which allows automated scanners to identify and exploit vulnerable instances at scale. Successful injection can execute attacker-controlled logic within the context of the cc-connect process.

No verified public proof-of-concept code is included with this advisory. Refer to the GitHub Issue Discussion and the VulDB CVE Record for additional technical context.

Detection Methods for CVE-2026-76760

Indicators of Compromise

HTTP requests to cc-connect webhook endpoints containing an exec parameter with shell metacharacters, backticks, or command separators
Unexpected child processes spawned by the cc-connect process on the host
Outbound network connections from the cc-connect process to unfamiliar IP addresses or command-and-control infrastructure
New or modified files in the cc-connect working directory following webhook activity

Detection Strategies

Enable request logging on any reverse proxy or web server fronting cc-connect and alert on webhook requests containing suspicious exec payloads
Correlate webhook request timestamps with process execution telemetry to identify anomalous command launches
Apply behavioral rules that flag unexpected shell, interpreter, or network-utility child processes originating from the cc-connect binary

Monitoring Recommendations

Ingest webhook access logs and host process telemetry into a centralized analytics platform for cross-source correlation
Track baseline process trees for cc-connect and alert on deviations such as spawned shells or scripting interpreters
Monitor egress traffic from hosts running cc-connect for connections to newly registered or low-reputation domains

How to Mitigate CVE-2026-76760

Immediate Actions Required

Restrict network exposure of cc-connect webhook endpoints to trusted management networks or place them behind authenticated reverse proxies
Inventory all cc-connect deployments at version 1.4.1 and earlier, and disable any instances that are not actively required
Inspect recent webhook logs for suspicious exec values and investigate any hosts showing anomalous child processes

Patch Information

The advisory does not reference a vendor-issued patch. Monitor the GitHub Project Repository and the GitHub Issue Discussion for updates. Until a fix is published, treat all cc-connect instances up to and including version 1.4.1 as vulnerable.

Workarounds

Block or filter incoming requests to the Authenticate webhook route at a web application firewall using rules that reject requests containing shell metacharacters in the exec parameter
Run cc-connect under a dedicated low-privilege service account with no shell access to limit the impact of successful injection
Apply operating system controls such as seccomp, AppArmor, or SELinux profiles to prevent the cc-connect process from spawning unexpected interpreters
Enforce strict egress network policies from cc-connect hosts to block outbound connections that are not explicitly required

bash

# Example WAF rule concept: reject webhook requests containing shell metacharacters in the exec parameter
# Adapt to your specific WAF syntax (ModSecurity, Nginx, Envoy, etc.)
SecRule ARGS:exec "@rx [;&|`$()<>]" \
    "id:1076760,\
     phase:2,\
     deny,\
     status:403,\
     msg:'CVE-2026-76760: Suspicious exec parameter in cc-connect webhook'"