Vulnerability-Lookup

CVE-2026-107399 (GCVE-0-2026-107399)

Vulnerability from cvelistv5 – Published: 2026-10-08 21:24 – Updated: 2026-10-08 21:24

Title

Mechanize sends credential headers to another origin after a meta refresh

Summary

The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize applies no origin trust boundary in Mechanize::HTTP::Agent#response_follow_meta_refresh when Mechanize#follow_meta_refresh is enabled. A page containing a meta refresh to another origin causes headers configured through Mechanize#request_headers= to be reapplied to the refresh request, allowing an attacker who controls content in the crawl to capture bearer tokens or session cookies. The default configuration is not affected because follow_meta_refresh is false, and the exposure is limited to caller-supplied default headers. This issue is fixed in version 2.14.1.

Severity

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-522 - Insufficiently Protected Credentials

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7595 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/sparklemotion/mechanize/securi…	x_refsource_CONFIRM
https://github.com/sparklemotion/mechanize/pull/676	x_refsource_MISC
https://github.com/sparklemotion/mechanize/commit…	x_refsource_MISC
https://github.com/sparklemotion/mechanize/commit…	x_refsource_MISC
https://github.com/sparklemotion/mechanize/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
sparklemotion	mechanize	Affected: < 2.15.0	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "mechanize",
          "vendor": "sparklemotion",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.15.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize applies no origin trust boundary in Mechanize::HTTP::Agent#response_follow_meta_refresh when Mechanize#follow_meta_refresh is enabled. A page containing a meta refresh to another origin causes headers configured through Mechanize#request_headers= to be reapplied to the refresh request, allowing an attacker who controls content in the crawl to capture bearer tokens or session cookies. The default configuration is not affected because follow_meta_refresh is false, and the exposure is limited to caller-supplied default headers. This issue is fixed in version 2.14.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-200",
              "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-522",
              "description": "CWE-522: Insufficiently Protected Credentials",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-08T21:24:46.349Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sparklemotion/mechanize/security/advisories/GHSA-c6rp-p8xm-4q9f",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sparklemotion/mechanize/security/advisories/GHSA-c6rp-p8xm-4q9f"
        },
        {
          "name": "https://github.com/sparklemotion/mechanize/pull/676",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sparklemotion/mechanize/pull/676"
        },
        {
          "name": "https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f"
        },
        {
          "name": "https://github.com/sparklemotion/mechanize/commit/84c74df87d15f5d119df268ba6aa79bc1e16a2c3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sparklemotion/mechanize/commit/84c74df87d15f5d119df268ba6aa79bc1e16a2c3"
        },
        {
          "name": "https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1"
        }
      ],
      "source": {
        "advisory": "GHSA-c6rp-p8xm-4q9f",
        "discovery": "UNKNOWN"
      },
      "title": "Mechanize sends credential headers to another origin after a meta refresh"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-107399",
    "datePublished": "2026-10-08T21:24:46.349Z",
    "dateReserved": "2026-10-07T21:07:54.989Z",
    "dateUpdated": "2026-10-08T21:24:46.349Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-107399",
      "date": "2026-10-10",
      "epss": "0.00362",
      "percentile": "0.28097"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "mechanize",
                "vendor": "sparklemotion",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 2.15.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize applies no origin trust boundary in Mechanize::HTTP::Agent#response_follow_meta_refresh when Mechanize#follow_meta_refresh is enabled. A page containing a meta refresh to another origin causes headers configured through Mechanize#request_headers= to be reapplied to the refresh request, allowing an attacker who controls content in the crawl to capture bearer tokens or session cookies. The default configuration is not affected because follow_meta_refresh is false, and the exposure is limited to caller-supplied default headers. This issue is fixed in version 2.14.1."
          }
        ],
        "id": "CVE-2026-107399",
        "lastModified": "2026-10-09T16:40:29.800",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 6.8,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 4.0,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-08T22:17:26.683",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/sparklemotion/mechanize/commit/84c74df87d15f5d119df268ba6aa79bc1e16a2c3"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/sparklemotion/mechanize/pull/676"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/sparklemotion/mechanize/security/advisories/GHSA-c6rp-p8xm-4q9f"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-200"
              },
              {
                "lang": "en",
                "value": "CWE-522"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-08T23:50:54+00:00",
      "cve": "CVE-2026-107399",
      "id": "CVE-2026-107399",
      "initial_release_date": "2026-10-08T21:24:46.349000+00:00",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "mechanize: mechanize: Information disclosure via cross-origin meta refresh",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107399.json",
      "version": "3"
    }
  }
}

FKIE_CVE-2026-107399

Vulnerability from fkie_nvd - Published: 2026-10-08 22:17 - Updated: 2026-10-09 16:40

Severity

6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f
	security-advisories@github.com	https://github.com/sparklemotion/mechanize/commit/84c74df87d15f5d119df268ba6aa79bc1e16a2c3
	security-advisories@github.com	https://github.com/sparklemotion/mechanize/pull/676
	security-advisories@github.com	https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1
	security-advisories@github.com	https://github.com/sparklemotion/mechanize/security/advisories/GHSA-c6rp-p8xm-4q9f

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mechanize",
          "vendor": "sparklemotion",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.15.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize applies no origin trust boundary in Mechanize::HTTP::Agent#response_follow_meta_refresh when Mechanize#follow_meta_refresh is enabled. A page containing a meta refresh to another origin causes headers configured through Mechanize#request_headers= to be reapplied to the refresh request, allowing an attacker who controls content in the crawl to capture bearer tokens or session cookies. The default configuration is not affected because follow_meta_refresh is false, and the exposure is limited to caller-supplied default headers. This issue is fixed in version 2.14.1."
    }
  ],
  "id": "CVE-2026-107399",
  "lastModified": "2026-10-09T16:40:29.800",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 4.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-08T22:17:26.683",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sparklemotion/mechanize/commit/84c74df87d15f5d119df268ba6aa79bc1e16a2c3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sparklemotion/mechanize/pull/676"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/sparklemotion/mechanize/security/advisories/GHSA-c6rp-p8xm-4q9f"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        },
        {
          "lang": "en",
          "value": "CWE-522"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-C6RP-P8XM-4Q9F

Vulnerability from github – Published: 2026-10-08 22:09 – Updated: 2026-10-08 22:09

Summary

Mechanize sends credential headers to another origin after a meta refresh

Details

Summary

mechanize applied no trust boundary to a meta refresh, so credentials set through Mechanize#request_headers= followed a refresh that pointed at another origin.

Details

Mechanize::HTTP::Agent#response_follow_meta_refresh fetched the refresh target with no notion of a crossed origin, so @request_headers were re-applied in full. An attacker who could place a meta refresh in a page the agent fetched — through stored content, an open redirect, or control of any page in the crawl — collected the same credentials as through an HTTP redirect, on a code path that had none of the redirect path's protections.

The refresh fetch passes an empty per-request headers hash, so only headers set through Mechanize#request_headers= were exposed.

This requires Mechanize#follow_meta_refresh = true. It is false by default, so an agent in its default configuration is not affected. Crawlers commonly enable it.

Impact

An attacker who can place a meta refresh in any page the agent fetches captures bearer tokens and session cookies set through request_headers=. Disclosure only; no integrity or availability impact.

Patches

Fixed in mechanize v2.14.1. A meta refresh that points at another origin is now subject to the same rule as an HTTP redirect: credentials and cookies are withheld from the request that follows it.

Workarounds

Leave Mechanize#follow_meta_refresh at its default of false, or avoid request_headers= for credentials when it is enabled.

Severity

6.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "mechanize"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.14.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-107399"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-522"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-08T22:09:03Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\n`mechanize` applied no trust boundary to a `meta` refresh, so credentials set through `Mechanize#request_headers=` followed a refresh that pointed at another origin.\n\n## Details\n\n`Mechanize::HTTP::Agent#response_follow_meta_refresh` fetched the refresh target with no notion of a crossed origin, so `@request_headers` were re-applied in full. An attacker who could place a `meta` refresh in a page the agent fetched \u2014 through stored content, an open redirect, or control of any page in the crawl \u2014 collected the same credentials as through an HTTP redirect, on a code path that had none of the redirect path\u0027s protections.\n\nThe refresh fetch passes an empty per-request headers hash, so only headers set through `Mechanize#request_headers=` were exposed.\n\nThis requires `Mechanize#follow_meta_refresh = true`. It is `false` by default, so an agent in its default configuration is not affected. Crawlers commonly enable it.\n\n## Impact\n\nAn attacker who can place a `meta` refresh in any page the agent fetches captures bearer tokens and session cookies set through `request_headers=`. Disclosure only; no integrity or availability impact.\n\n## Patches\n\nFixed in `mechanize` v2.14.1. A `meta` refresh that points at another origin is now subject to the same rule as an HTTP redirect: credentials and cookies are withheld from the request that follows it.\n\n## Workarounds\n\nLeave `Mechanize#follow_meta_refresh` at its default of `false`, or avoid `request_headers=` for credentials when it is enabled.",
  "id": "GHSA-c6rp-p8xm-4q9f",
  "modified": "2026-10-08T22:09:03Z",
  "published": "2026-10-08T22:09:03Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sparklemotion/mechanize/security/advisories/GHSA-c6rp-p8xm-4q9f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sparklemotion/mechanize/pull/676"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sparklemotion/mechanize/commit/84c74df87d15f5d119df268ba6aa79bc1e16a2c3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sparklemotion/mechanize"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Mechanize sends credential headers to another origin after a meta refresh"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-107399 (GCVE-0-2026-107399)

FKIE_CVE-2026-107399

GHSA-C6RP-P8XM-4Q9F

Summary

Details

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature

Related by attack behaviour