{"id":"CVE-2026-9255","aliases":["EUVD-2026-31471","GHSA-cv6r-hx5v-c4m6"],"status":"published","title":"Tool Execution Without Authorization via Piped Stdin in Kiro CLI","description":"Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local attacker to execute arbitrary tools, including shell commands, without user approval by crafting content that is piped to kiro-cli via stdin.\n\n\n\nWe recommend you to upgrade to kiro-cli version 1.28.0 or later.","severity":{"version":"4.0","score":8.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00128,"percentile":0.02501,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-862"],"published":"2026-05-22T16:38:10Z","modified":"2026-07-23T16:10:00Z","products":[{"vendor":"amazon","product":"kiro_cli"},{"vendor":"aws","product":"kiro cli"}],"references":[{"url":"https://kiro.dev/changelog/cli/1-28/","tags":["release-notes","Release Notes"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-035-aws/","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9255"},{"url":"https://aws.amazon.com/security/security-bulletins/2026-035-aws"},{"url":"https://kiro.dev/changelog/cli/1-28"},{"url":"https://github.com/advisories/GHSA-cv6r-hx5v-c4m6"}],"sources":{"cve":[{"id":"CVE-2026-9255","title":"Tool Execution Without Authorization via Piped Stdin in Kiro CLI","description":"Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local attacker to execute arbitrary tools, including shell commands, without user approval by crafting content that is piped to kiro-cli via stdin.\n\n\n\nWe recommend you to upgrade to kiro-cli version 1.28.0 or later.","status":"published","published":"2026-05-22T16:38:10.522Z","modified":"2026-05-23T03:55:58.873Z","cvss":[{"version":"4.0","score":8.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T13:42:26.790871Z"}],"euvd":[{"id":"EUVD-2026-31471","description":"Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local attacker to execute arbitrary tools, including shell commands, without user approval by crafting content that is piped to kiro-cli via stdin.\n\n\n\nWe recommend you to upgrade to kiro-cli version 1.28.0 or later.","status":"published","published":"2026-05-22T16:38:10Z","modified":"2026-05-23T03:55:58Z","cvss":[{"version":"4.0","score":8.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:21:12.112235Z"}],"ghsa":[{"id":"GHSA-cv6r-hx5v-c4m6","title":"Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows...","description":"Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local attacker to execute arbitrary tools, including shell commands, without user approval by crafting content that is piped to kiro-cli via stdin.\n\n\n\nWe recommend you to upgrade to kiro-cli version 1.28.0 or later.","status":"published","published":"2026-05-26T13:30:19Z","modified":"2026-05-26T13:30:27Z","cvss":[{"version":"4.0","score":8.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/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":"high"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T15:08:16.245994Z"}],"nvd":[{"id":"CVE-2026-9255","description":"Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local attacker to execute arbitrary tools, including shell commands, without user approval by crafting content that is piped to kiro-cli via stdin.\n\n\n\nWe recommend you to upgrade to kiro-cli version 1.28.0 or later.","status":"published","published":"2026-05-22T17:16:49.767Z","modified":"2026-07-23T16:10:00.137Z","cvss":[{"version":"4.0","score":8.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/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":"high","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:12:20.131508Z"}]}}