Keycloak on Red Hat Authorization Header incorrect behavior order

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Keycloak on Red Hat. Affected is an unknown function of the component Authorization Header Handler. The manipulation results in incorrect behavior order. This vulnerability is known as CVE-2026-0707. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in Keycloak on Red Hat (affected version not known). Affected is some unknown functionality of the component Authorization Header Handler. The manipulation with an unknown input leads to a incorrect behavior order vulnerability. CWE is classifying the issue as CWE-551. If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2026-0707 since 01/08/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/04/2026).

The vulnerability scanner Nessus provides a plugin with the ID 300554 (Keycloak < 26.5.4 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (300554) and CERT Bund (WID-SEC-2026-0034). Once again VulDB remains the best source for vulnerability data.

Affected

  • Open Source Keycloak
  • Red Hat Enterprise Linux

Productinfo

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (redhat): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Incorrect behavior order
CWE: CWE-551
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 300554
Nessus Name: Keycloak < 26.5.4 Multiple Vulnerabilities

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

01/08/2026 Advisory disclosed
01/08/2026 +0 days CVE reserved
01/08/2026 +0 days VulDB entry created
03/04/2026 +55 days VulDB entry last update

Sourcesinfo

Advisory: access.redhat.com
Status: Confirmed

CVE: CVE-2026-0707 (🔒)
GCVE (CVE): GCVE-0-2026-0707
GCVE (VulDB): GCVE-100-340020
CERT Bund: WID-SEC-2026-0034 - Keycloak: Schwachstelle erm&ouml;glicht Umgehen von Sicherheitsvorkehrungen

Entryinfo

Created: 01/08/2026 08:11
Updated: 03/04/2026 19:18
Changes: 01/08/2026 08:11 (60), 01/08/2026 19:26 (7), 03/04/2026 19:18 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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