CVE-2026-33167

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.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0	Patch
https://github.com/rails/rails/releases/tag/v8.1.2.1	Release Notes
https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-23 23:17

Updated : 2026-08-12 16:45

NVD link : CVE-2026-33167

Mitre link : CVE-2026-33167

CVE.ORG link : CVE-2026-33167

JSON object : View

Products Affected

rubyonrails

rails

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

{"id": "CVE-2026-33167", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33167", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-24T18:44:05.658370Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 1.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "LOW", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "UNREPORTED", "providerUrgency": "NOT_DEFINED", "userInteraction": "PASSIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "rails", "product": "actionpack", "versions": [{"status": "affected", "version": ">= 8.1.0, < 8.1.2.1"}]}]}], "published": "2026-03-23T23:17:12.707", "references": [{"url": "https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/rails/rails/releases/tag/v8.1.2.1", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Action Pack es una Rubygem para construir aplicaciones web en el framework de Rails. En versiones de la rama 8.1 anteriores a la 8.1.2.1, la p\u00e1gina de excepciones de depuraci\u00f3n no escapa correctamente los mensajes de excepci\u00f3n. Un mensaje de excepci\u00f3n cuidadosamente elaborado podr\u00eda inyectar HTML y JavaScript arbitrarios en la p\u00e1gina, lo que lleva a XSS. Esto afecta a las aplicaciones con p\u00e1ginas de excepci\u00f3n detalladas habilitadas (`config.consider_all_requests_local = true`), lo cual es el valor predeterminado en desarrollo. La versi\u00f3n 8.1.2.1 contiene un parche."}], "lastModified": "2026-08-12T16:45:36.727", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "978E0135-D14B-41DE-87E4-CF059A23E189", "versionEndExcluding": "8.1.2.1", "versionStartIncluding": "8.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}