Vulnerability-Lookup

CVE-2026-54770 (GCVE-0-2026-54770)

Vulnerability from cvelistv5 – Published: 2026-08-20 16:31 – Updated: 2026-08-20 16:31

Title

WebOb: Open redirect in Location header normalization via leading C0 control / space characters

Summary

WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith("//") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application's redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11.

Severity

6.1 (Medium)


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

CWE

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/Pylons/webob/security/advisori…	x_refsource_CONFIRM
https://github.com/Pylons/webob/commit/ff89560643…	x_refsource_MISC
https://github.com/Pylons/webob/tree/1.8.11	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
Pylons	webob	Affected: < 1.8.11	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "webob",
          "vendor": "Pylons",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.8.11"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith(\"//\") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application\u0027s redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-601",
              "description": "CWE-601: URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-20T16:31:46.791Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g"
        },
        {
          "name": "https://github.com/Pylons/webob/commit/ff89560643fb252751b4db8806a283b5377f1f07",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Pylons/webob/commit/ff89560643fb252751b4db8806a283b5377f1f07"
        },
        {
          "name": "https://github.com/Pylons/webob/tree/1.8.11",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Pylons/webob/tree/1.8.11"
        }
      ],
      "source": {
        "advisory": "GHSA-6hx8-3wjj-gr8g",
        "discovery": "UNKNOWN"
      },
      "title": "WebOb: Open redirect in Location header normalization via leading C0 control / space characters"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54770",
    "datePublished": "2026-08-20T16:31:46.791Z",
    "dateReserved": "2026-06-15T23:23:57.713Z",
    "dateUpdated": "2026-08-20T16:31:46.791Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-54770\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-20T17:18:18.277\",\"lastModified\":\"2026-08-20T17:18:18.277\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith(\\\"//\\\") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application\u0027s redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"Pylons\",\"product\":\"webob\",\"versions\":[{\"version\":\"\u003c 1.8.11\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N\",\"baseScore\":6.1,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":2.7}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-601\"}]}],\"references\":[{\"url\":\"https://github.com/Pylons/webob/commit/ff89560643fb252751b4db8806a283b5377f1f07\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/Pylons/webob/tree/1.8.11\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

FKIE_CVE-2026-54770

Vulnerability from fkie_nvd - Published: 2026-08-20 17:18 - Updated: 2026-08-20 17:18

Severity

6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Pylons/webob/commit/ff89560643fb252751b4db8806a283b5377f1f07
	security-advisories@github.com	https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g
	security-advisories@github.com	https://github.com/Pylons/webob/tree/1.8.11

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "webob",
          "vendor": "Pylons",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.8.11"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith(\"//\") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application\u0027s redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11."
    }
  ],
  "id": "CVE-2026-54770",
  "lastModified": "2026-08-20T17:18:18.277",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-20T17:18:18.277",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Pylons/webob/commit/ff89560643fb252751b4db8806a283b5377f1f07"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Pylons/webob/tree/1.8.11"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2026-54770 (GCVE-0-2026-54770)

FKIE_CVE-2026-54770

Tags

Sightings

Nomenclature