Vulnerability-Lookup

WID-SEC-W-2026-0034

Vulnerability from csaf_certbund - Published: 2026-01-07 23:00 - Updated: 2026-01-07 23:00

Summary

Keycloak: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung

Keycloak ermöglicht Single Sign-On mit Identity and Access Management für moderne Anwendungen und Dienste. Red Hat Enterprise Linux (RHEL) ist eine populäre Linux-Distribution.

Angriff

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Keycloak und Red Hat Enterprise Linux ausnutzen, um Sicherheitsvorkehrungen zu umgehen.

Betroffene Betriebssysteme

- Linux - UNIX

JSON

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{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Keycloak erm\u00f6glicht Single Sign-On mit Identity and Access Management f\u00fcr moderne Anwendungen und Dienste.\r\nRed Hat Enterprise Linux (RHEL) ist eine popul\u00e4re Linux-Distribution.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Keycloak und Red Hat Enterprise Linux ausnutzen, um Sicherheitsvorkehrungen zu umgehen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-0034 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0034.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-0034 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0034"
      },
      {
        "category": "external",
        "summary": "Red Hat Bugtracker vom 2026-01-08",
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2427768"
      },
      {
        "category": "external",
        "summary": "RedHat Customer Portal vom 2026-01-08",
        "url": "https://access.redhat.com/security/cve/cve-2026-0707"
      }
    ],
    "source_lang": "en-US",
    "title": "Keycloak: Schwachstelle erm\u00f6glicht Umgehen von Sicherheitsvorkehrungen",
    "tracking": {
      "current_release_date": "2026-01-07T23:00:00.000+00:00",
      "generator": {
        "date": "2026-01-08T08:50:22.661+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-0034",
      "initial_release_date": "2026-01-07T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-01-07T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Open Source Keycloak",
            "product": {
              "name": "Open Source Keycloak",
              "product_id": "T024196",
              "product_identification_helper": {
                "cpe": "cpe:/a:keycloak:keycloak:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "Keycloak",
                "product": {
                  "name": "Red Hat Enterprise Linux Keycloak",
                  "product_id": "T048597",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:redhat:enterprise_linux:keycloak"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Enterprise Linux"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-0707",
      "product_status": {
        "known_affected": [
          "T048597",
          "T024196"
        ]
      },
      "release_date": "2026-01-07T23:00:00.000+00:00",
      "title": "CVE-2026-0707"
    }
  ]
}

CVE-2026-0707 (GCVE-0-2026-0707)

Vulnerability from cvelistv5 – Published: 2026-01-08 03:41 – Updated: 2026-01-08 15:55

Title

Keycloak: keycloak authorization header parsing leading to potential security control bypass

Summary

A flaw was found in Keycloak. The Keycloak Authorization header parser is overly permissive regarding the formatting of the "Bearer" authentication scheme. It accepts non-standard characters (such as tabs) as separators and tolerates case variations that deviate from RFC 6750 specifications.

Severity ?

5.3 (Medium)


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

CWE

CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

Assigner

redhat

References

URL

Tags

	https://access.redhat.com/security/cve/CVE-2026-0707	vdb-entryx_refsource_REDHAT
	https://bugzilla.redhat.com/show_bug.cgi?id=2427768	issue-trackingx_refsource_REDHAT

Impacted products

	Vendor	Product	Version
	Red Hat	Red Hat Build of Keycloak	cpe:/a:redhat:build_keycloak:

Credits

Red Hat would like to thank Guanping Zhang for reporting this issue.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-0707",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-08T15:54:59.827077Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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      }
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    "cna": {
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
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          ],
          "defaultStatus": "affected",
          "packageName": "rhbk/keycloak-rhel9",
          "product": "Red Hat Build of Keycloak",
          "vendor": "Red Hat"
        }
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          "value": "Red Hat would like to thank Guanping Zhang for reporting this issue."
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      "descriptions": [
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        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "namespace": "https://access.redhat.com/security/updates/classification/",
              "value": "Moderate"
            },
            "type": "Red Hat severity rating"
          }
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
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            }
          ]
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      ],
      "providerMetadata": {
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      },
      "references": [
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          "tags": [
            "vdb-entry",
            "x_refsource_REDHAT"
          ],
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        },
        {
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          "tags": [
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          "time": "2026-01-07T00:00:00+00:00",
          "value": "Made public."
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      "workarounds": [
        {
          "lang": "en",
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        }
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      },
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    "datePublished": "2026-01-08T03:41:27.775Z",
    "dateReserved": "2026-01-08T02:52:15.720Z",
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    "state": "PUBLISHED"
  },
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}

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.

Action not permitted

WID-SEC-W-2026-0034

CVE-2026-0707 (GCVE-0-2026-0707)

Tags

Sightings

Nomenclature