{"id":"CVE-2026-33167","aliases":["EUVD-2026-14614","GHSA-pgm4-439c-5jp6","UBUNTU-CVE-2026-33167"],"status":"published","title":"Rails has a possible XSS vulnerability in its Action Pack debug exceptions","description":"Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.","severity":{"version":"4.0","score":1.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00266,"percentile":0.18627,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-03-23T20:45:15Z","modified":"2026-10-28T02:30:54Z","fixes":[{"ecosystem":"RubyGems","package":"actionpack","fixed_in":["8.1.2.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"actionpack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.1.0"},{"fixed":"8.1.2.1"}]}]},{"source":"osv","ecosystem":"RubyGems","package":"actionpack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.1.0"},{"fixed":"8.1.2.1"}]}],"versions":["8.1.0","8.1.1","8.1.2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:4.1.10-1","2:4.2.5-1","2:4.2.5.1-1","2:4.2.5.2-2","2:4.2.6-1","2:4.2.6-1ubuntu0.1~esm1","2:4.2.6-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:4.2.9-2","2:4.2.9-4","2:4.2.10-0ubuntu4","2:4.2.10-0ubuntu4+esm1","2:4.2.10-0ubuntu4+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:5.2.2.1+dfsg-1ubuntu1","2:5.2.3+dfsg-3","2:5.2.3+dfsg-3ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:6.0.3.7+dfsg-2","2:6.1.4.1+dfsg-8ubuntu2","2:6.1.4.1+dfsg-8ubuntu2+esm1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:6.1.7.3+dfsg-2build1","2:6.1.7.3+dfsg-3"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:6.1.7.3+dfsg-7","2:7.2.2.1+dfsg-7"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:7.2.3+dfsg-2","2:7.2.3.2+dfsg-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"rails","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:7.2.2.1+dfsg-7","2:7.2.2.2+dfsg-2","2:7.2.3+dfsg-2"]}],"products":[{"vendor":"rails","product":"actionpack"},{"vendor":"rubyonrails","product":"rails"}],"references":[{"url":"https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web","report"]},{"url":"https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0","tags":["x_refsource_MISC","Patch","fix","web","report"]},{"url":"https://github.com/rails/rails/releases/tag/v8.1.2.1","tags":["x_refsource_MISC","Release Notes","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33167","tags":["advisory"]},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2026-33167.yml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-pgm4-439c-5jp6"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33167.json","tags":["advisory"]},{"url":"https://github.com/rails/rails","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-33167","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-33167","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-33167","title":"Rails has a possible XSS vulnerability in its Action Pack debug exceptions","description":"Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.","status":"published","published":"2026-03-23T22:58:53.577Z","modified":"2026-03-24T18:44:13.02Z","cvss":[{"version":"4.0","score":1.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U","level":"low","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:20:08.009733Z"}],"euvd":[{"id":"EUVD-2026-14614","description":"Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.","status":"published","published":"2026-03-23T22:58:53Z","modified":"2026-03-24T18:44:13Z","cvss":[{"version":"4.0","score":1.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U","level":"low"}],"updated_at":"2026-11-02T19:25:29.933437Z"}],"ghsa":[{"id":"GHSA-pgm4-439c-5jp6","title":"Rails has a possible XSS vulnerability in its Action Pack debug exceptions","description":"### Impact\nThe debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development.\n\n### Releases\nThe fixed releases are available at the normal locations.\n\n### Credit\nThis issue was responsibly reported by Hackerone researcher [fbettag](https://hackerone.com/fbettag).","status":"published","published":"2026-03-23T20:45:15Z","modified":"2026-05-13T16:14:37Z","cvss":[{"version":"4.0","score":1.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U","level":"low"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:40:08.003212Z"}],"nvd":[{"id":"CVE-2026-33167","description":"Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.","status":"published","published":"2026-03-23T23:17:12.707Z","modified":"2026-08-12T16:45:36.727Z","cvss":[{"version":"4.0","score":1.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/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":"low","assessor":"secondary"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:10.568062Z"}],"osv":[{"id":"CVE-2026-33167","title":"Rails has a possible XSS vulnerability in its Action Pack debug exceptions","description":"Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.","status":"published","published":"2026-03-23T22:58:53.577Z","modified":"2026-10-28T02:30:54.903528718Z","cvss":[{"version":"4.0","score":1.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U","level":"low"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:01.548715Z"},{"id":"GHSA-pgm4-439c-5jp6","title":"Rails has a possible XSS vulnerability in its Action Pack debug exceptions","description":"### Impact\nThe debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development.\n\n### Releases\nThe fixed releases are available at the normal locations.\n\n### Credit\nThis issue was responsibly reported by Hackerone researcher [fbettag](https://hackerone.com/fbettag).","status":"published","published":"2026-03-23T20:45:15Z","modified":"2026-09-10T03:50:40.310151551Z","cvss":[{"version":"4.0","score":1.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U","level":"low"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:53.244788Z"},{"id":"UBUNTU-CVE-2026-33167","description":"Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.","status":"published","published":"2026-03-23T23:17:00Z","modified":"2026-10-17T12:58:10.471714151Z","cvss":[{"version":"4.0","score":1.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U","level":"low"},{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:16.036833Z"}]}}