{"id":"CVE-2026-76243","aliases":["EUVD-2026-62407","GHSA-fp6w-8wpg-74g5","GHSA-rqm4-4g3h-95wm"],"status":"published","title":"stigmem before 0.9.0a2 Authentication Bypass via Disabled Auth","description":"stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.","severity":{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00564,"percentile":0.47179,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-285","CWE-862"],"published":"2026-05-29T22:13:47Z","modified":"2026-10-28T02:30:40Z","fixes":[{"ecosystem":"PyPI","package":"stigmem-node","fixed_in":["0.9.0a2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"stigmem-node","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.0a2"}]}]},{"source":"osv","ecosystem":"PyPI","package":"stigmem-node","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.0a2"}]}],"versions":["0.9.0a1"]}],"products":[{"vendor":"eidetic-labs","product":"stigmem"}],"references":[{"url":"https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-fp6w-8wpg-74g5","tags":["vendor-advisory","advisory","web"]},{"url":"https://www.vulncheck.com/advisories/stigmem-before-0a2-authentication-bypass-via-disabled-auth","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35","tags":["web"]},{"url":"https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/SECURITY.md","tags":["web"]},{"url":"https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2","tags":["web"]},{"url":"https://github.com/advisories/GHSA-fp6w-8wpg-74g5"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76243","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-rqm4-4g3h-95wm"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76243.json","tags":["advisory"]},{"url":"https://github.com/eidetic-labs/stigmem","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-76243","title":"stigmem before 0.9.0a2 Authentication Bypass via Disabled Auth","description":"stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.","status":"published","published":"2026-08-19T14:02:20.16Z","modified":"2026-08-25T02:01:37.954Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"}],"cwes":["CWE-285"],"updated_at":"2026-11-02T13:46:10.323375Z"}],"euvd":[{"id":"EUVD-2026-62407","description":"stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.","status":"published","published":"2026-08-19T14:02:20Z","modified":"2026-08-25T02:01:37Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-02T18:01:33.760029Z"}],"ghsa":[{"id":"GHSA-fp6w-8wpg-74g5","title":"stigmem-node: Auth-disabled deployments may grant broad anonymous access outside loopback","description":"### Impact\nStigmem nodes configured with authentication disabled could grant the anonymous identity broad read/write/federation capabilities if exposed outside a loopback-only local development environment. Impacted users are operators who intentionally disabled authentication while binding the node to a non-loopback URL.\n\n### Patches\nPatched in 0.9.0a2. The node now refuses unauthenticated operation outside loopback-only local development.\n\n### Workarounds\nBefore upgrading, keep authentication enabled for all non-local deployments and do not expose nodes with authentication disabled to untrusted networks.\n\n### Upgrade\nUpgrade to the patched release:\n\n```bash\npip install --upgrade --pre stigmem-node\n```\n\nIf developers install through the Stigmem meta-package instead, they should use the matching extra for their deployments, for example:\n\n```bash\npip install --upgrade --pre 'stigmem[node]'\n```\n\n### Resources\n- Release: https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2\n- Changelog: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35\n- Security policy and posture: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/SECURITY.md","status":"published","published":"2026-05-29T22:13:47Z","modified":"2026-05-29T22:13:51Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-285","CWE-862"],"updated_at":"2026-11-02T14:40:15.638885Z"},{"id":"GHSA-rqm4-4g3h-95wm","title":"stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on...","description":"stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.","status":"published","published":"2026-08-19T15:32:36Z","modified":"2026-08-19T15:32:46Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"}],"cwes":["CWE-285"],"updated_at":"2026-11-02T15:10:39.892418Z"}],"nvd":[{"id":"CVE-2026-76243","description":"stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.","status":"published","published":"2026-08-19T14:17:56.693Z","modified":"2026-09-24T20:43:32.537Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"}],"cwes":["CWE-285"],"updated_at":"2026-11-02T14:12:39.962615Z"}],"osv":[{"id":"CVE-2026-76243","title":"stigmem before 0.9.0a2 Authentication Bypass via Disabled Auth","description":"stigmem versions before 0.9.0a2 allow unauthenticated access when authentication is disabled on non-loopback deployments. Attackers can perform read, write, and federation operations with anonymous identity when nodes are exposed outside local development environments.","status":"published","published":"2026-08-19T14:02:20.16Z","modified":"2026-10-28T02:30:40.923066146Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-285"],"updated_at":"2026-11-02T15:45:17.102988Z"},{"id":"GHSA-fp6w-8wpg-74g5","title":"stigmem-node: Auth-disabled deployments may grant broad anonymous access outside loopback","description":"### Impact\nStigmem nodes configured with authentication disabled could grant the anonymous identity broad read/write/federation capabilities if exposed outside a loopback-only local development environment. Impacted users are operators who intentionally disabled authentication while binding the node to a non-loopback URL.\n\n### Patches\nPatched in 0.9.0a2. The node now refuses unauthenticated operation outside loopback-only local development.\n\n### Workarounds\nBefore upgrading, keep authentication enabled for all non-local deployments and do not expose nodes with authentication disabled to untrusted networks.\n\n### Upgrade\nUpgrade to the patched release:\n\n```bash\npip install --upgrade --pre stigmem-node\n```\n\nIf developers install through the Stigmem meta-package instead, they should use the matching extra for their deployments, for example:\n\n```bash\npip install --upgrade --pre 'stigmem[node]'\n```\n\n### Resources\n- Release: https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2\n- Changelog: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35\n- Security policy and posture: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/SECURITY.md","status":"published","published":"2026-05-29T22:13:47Z","modified":"2026-08-20T04:04:15.333636609Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-285","CWE-862"],"updated_at":"2026-11-02T15:46:46.760785Z"}]}}