{"answers":{"affected":"1 open source package ship an affected version, including refbase-mcp.","exploited":"There is no known exploitation of MAL-2026-11477 in the wild and no public exploit code.","fix":"Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.","what":"MAL-2026-11477 is a malicious package in refbase-mcp, published on 31 Jul 2026."},"fix_prompt":"MAL-2026-11477 is a malicious package: refbase-mcp (npm). Every version was published to cause harm.\n\nTask:\n1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.\n2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.\n3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.\n4. If the package is not used anywhere, say so and change nothing.\n\nReference: https://insights.sbomify.com/MAL-2026-11477/ (Markdown: https://insights.sbomify.com/MAL-2026-11477/index.md)","id":"MAL-2026-11477","markdown":"https://insights.sbomify.com/MAL-2026-11477/index.md","name":"MAL-2026-11477","record":{"aliases":["GHSA-5xcj-w4qg-g78g"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"Package published as 'refbase-mcp' self-describes as 'install-email-research'. The postinstall hook loads lib/report.js which, when a consent flag is present in ~/.install-email-research.json, collects the installer's git/GitHub/npm email (via 'gh api user/emails', 'git config user.email', and parsing ~/.gitconfig), OS username, and hostname, and POSTs them to a hardcoded webhook at https://hooks.zapier.com/hooks/catch/28124699/42vdpup/. Consent is collected only through the interactive CLI in bin/cli.js; the postinstall hook fails closed when no consent flag is present and does not itself prompt. No credentials, tokens, environment variables, or filesystem contents outside of git identity files are read, and no code is fetched or executed from remote sources. Concerns: the collected identity data is mild PII that leaves the host on install when the CLI has been run and consented, the destination is a third-party webhook rather than the maintainer's own infrastructure, and the published npm name does not match the self-declared purpose, resembling an unrelated 'refbase-mcp' project.\n\nAny computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.","ecosystems":["npm"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":false,"headline":"Malicious code in refbase-mcp (npm)","id":"MAL-2026-11477","indexable":true,"kev":null,"kind":"malicious","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"npm","fixed":[],"introduced":[],"last_affected":[],"package":"refbase-mcp","purl":"pkg:npm/refbase-mcp","source":"MAL-2026-11477"}],"products":null,"published":"2026-07-31","related":[],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"OpenSSF Malicious Packages","prefix":"MAL"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":null,"url":"https://insights.sbomify.com/MAL-2026-11477/"}