Vulnerability database
Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.
4 results
Aug 25, 2026mcp-shell is an MCP server for running shell commands securely, auditably, and on demand.CVE-2026-55582 · Other software · sonirico · reported by GitHubHigh 8.4
mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, the default security.yaml allows /usr/bin/git, while security.go omits ! from containsShellMetacharacters and containsDangerousShellConstructs and applies no per-executable argument policy. A caller of the shell_exec MCP tool can provide the command argument /usr/bin/git -c alias.pwn=!<arbitrary-command>, causing Git to create a shell alias and execute arbitrary OS commands as the mcp-shell process user. The default Docker image runs as mcpuser with Git installed and secure mode enabled, so the bypass is exploitable in the default deployment without additional authentication beyond MCP connectivity. This issue is fixed in version 0.6.0.
- Product
- mcp-shell
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 25, 2026mcp-shell is an MCP server for running shell commands securely, auditably, and on demand.CVE-2026-55581 · Other software · sonirico · reported by GitHubHigh 8.4
mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, the default Docker security.yaml includes /bin/bash in allowed_executables, while security.go validates only the first token and checkBlockedPatternsAndCommands does not reject the shell command-mode flag -c. A caller of the shell_exec MCP tool can provide the command argument `/bin/bash -c <arbitrary-command>`, which passes validation and reaches executor.go, where parseCommand and exec.CommandContext execute the arbitrary command as mcpuser outside the intended allowlist. This issue is fixed in version 0.6.0.
- Product
- mcp-shell
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 25, 2026mcp-shell is an MCP server for running shell commands securely, auditably, and on demand.CVE-2026-55580 · Other software · sonirico · reported by GitHubHigh 8.6
mcp-shell is an MCP server for running shell commands securely, auditably, and on demand. Prior to 0.6.0, config.go initializes Security.Enabled to false, and when MCP_SHELL_SEC_CONFIG_FILE is unset, main.go starts the documented bare-binary deployment without a security policy. SecurityValidator.validateCommand in security.go then short-circuits and allows every command supplied to the shell_exec MCP tool, so an LLM connected over stdio can execute unrestricted OS commands as the mcp-shell process user. The README from-source installation and MCP client configuration omit MCP_SHELL_SEC_CONFIG_FILE, making the insecure state the documented default. This issue is fixed in version 0.6.0.
- Product
- mcp-shell
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 7, 2026A command injection vulnerability in the shell_exec function of sonirico mcp-shell v0.3.1 allows attackers to execute arbitrary commands via supplying a craftedCVE-2025-61489 · Other software · Sonirico · reported by MITREMedium 6.5
A command injection vulnerability in the shell_exec function of sonirico mcp-shell v0.3.1 allows attackers to execute arbitrary commands via supplying a crafted command string.
- Product
- Mcp-shell
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.
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