CVE-2026-61560
CRITICAL · 9.8Real vuln, patch live, but no KEV, PoC, or confirmed exploitation; early-stage disclosure chatter.
What: @zereight/mcp-gitlab Model Context Protocol server exposes unauthenticated SSE transport mode allowing arbitrary file read and GitLab token theft (CVSS 9.8 CRITICAL). Affects Docker default configs.
Why it matters: Published yesterday; patch available in v2.1.27. Critical severity chain enables token exfiltration and full account takeover. Default-unsafe Docker deployments increase real-world risk. Not yet KEV-listed but severity and patch availability suggest active monitoring by defenders.
Where it's seen: Social posts (Bluesky) amplifying NVD/advisory details with CVSS highlight. Chatter mirrors official disclosure with no independent PoC confirmation or in-the-wild reports yet visible.
RISK: CRITICAL — Unauthenticated RCE-equivalent via token theft in default deployment; patch exists but adoption lag typical.
Description
`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Prior to version 2.1.27, the SSE transport mode (`SSE=true`) exposes all MCP tools without any authentication. The `upload_markdown` tool reads arbitrary files from the server's local filesystem via an unsanitized `file_path` parameter and uploads them to a GitLab project. Combined, any unauthenticated network-reachable attacker can read `/proc/self/environ` to steal the server's `GITLAB_PERSONAL_ACCESS_TOKEN` and achieve full GitLab account takeover. This is the default configuration for Docker deployments. Version 2.1.27 contains a patch.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Attack vector
- Network
- Complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High