cc-connect: Missing authentication in MAX webhook mode
Summary
cc-connect through version 1.5.0 accepts unauthenticated updates on the webhook listener of the MAX platform adapter when no webhook_secret is configured. A remote attacker who can reach the listener on port 8080 can forge updates that carry an allowed or admin user ID and run privileged commands such as /shell on the host. The flaw only applies to installations that use MAX webhook mode without a secret.
Affected
- cc-connect versions 0 to 1.5.0 (default configuration is unaffected)
- Only the MAX platform adapter in webhook mode without webhook_secret
Fixed in
Unknown.
- No fixed release found; check https://github.com/chenhg5/cc-connect/releases
- A proposed fix is tracked in issue #1968 (PR #1969); merge status unknown
Workaround
- Set a non-empty webhook_secret for MAX webhook mode
- Do not expose the webhook listener to the internet; restrict it to trusted networks or a reverse proxy with access controls
- Switch away from MAX webhook mode if it is not required
- Restrict which users can send commands, so shell-level access is limited
Exploitation
- CISA SSVC: exploitation none, not automatable, technical impact total
- Not known to be exploited; no public proof of concept found
- EPSS 0.00451
- The GitHub issue describes the flaw in detail
Our recommendation
- Check whether cc-connect 1.5.0 or earlier runs with MAX webhook mode and no webhook_secret
- If affected, set a webhook_secret and restrict network access to the listener, or disable webhook mode
- Review the generic webhook server issue #1964 (PR #1965) as well
- Monitor the vendor for a fixed release and update promptly
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- cc-connect GitHub repository github.com
- max.go at v1.5.0 github.com
- cc-connect issue #1968 github.com
- VulnCheck advisory www.vulncheck.com
- VulDB entry vuldb.com
- OpenCVE CVE-2026-108549 app.opencve.io
- Vulners CVE-2026-108549 vulners.com
- cc-connect pull request #1965 github.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 04:45.
Original description (NVD)
cc-connect through 1.5.0 contains a missing authentication vulnerability in the MAX platform adapter webhook mode in platform/max/max.go that accepts unauthenticated updates when no webhook_secret is configured. Remote attackers reaching the webhook listener on port 8080 can forge updates with an allowed or admin user_id to run privileged commands like /shell on the host.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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