Vulnerability-Lookup

GHSA-PGM4-439C-5JP6

Vulnerability from github – Published: 2026-03-23 20:45 – Updated: 2026-03-25 20:46

Summary

Rails has a possible XSS vulnerability in its Action Pack debug exceptions

Details

Impact

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.

Releases

The fixed releases are available at the normal locations.

Severity ?

1.3 (Low)


                  
                    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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "actionpack"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.1.0"
            },
            {
              "fixed": "8.1.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33167"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-23T20:45:15Z",
    "nvd_published_at": "2026-03-23T23:17:12Z",
    "severity": "LOW"
  },
  "details": "### 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.",
  "id": "GHSA-pgm4-439c-5jp6",
  "modified": "2026-03-25T20:46:51Z",
  "published": "2026-03-23T20:45:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33167"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rails/rails"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/releases/tag/v8.1.2.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Rails has a possible XSS vulnerability in its Action Pack debug exceptions"
}

CVE-2026-33167 (GCVE-0-2026-33167)

Vulnerability from cvelistv5 – Published: 2026-03-23 22:58 – Updated: 2026-03-24 18:44

Title

Rails has a possible XSS vulnerability in its Action Pack debug exceptions

Summary

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 ?

1.3 (Low)


                        
                          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

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/rails/rails/security/advisorie…	x_refsource_CONFIRM
	https://github.com/rails/rails/commit/6752711c8c3…	x_refsource_MISC
	https://github.com/rails/rails/releases/tag/v8.1.2.1	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	rails	actionpack	Affected: >= 8.1.0, < 8.1.2.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33167",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-24T18:44:05.658370Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-24T18:44:13.020Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "actionpack",
          "vendor": "rails",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 8.1.0, \u003c 8.1.2.1"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 1.3,
            "baseSeverity": "LOW",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "PASSIVE",
            "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-23T23:18:56.415Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6"
        },
        {
          "name": "https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0"
        },
        {
          "name": "https://github.com/rails/rails/releases/tag/v8.1.2.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rails/rails/releases/tag/v8.1.2.1"
        }
      ],
      "source": {
        "advisory": "GHSA-pgm4-439c-5jp6",
        "discovery": "UNKNOWN"
      },
      "title": "Rails has a possible XSS vulnerability in its Action Pack debug exceptions"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33167",
    "datePublished": "2026-03-23T22:58:53.577Z",
    "dateReserved": "2026-03-17T21:17:08.888Z",
    "dateUpdated": "2026-03-24T18:44:13.020Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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