MediumCVE-2026-16104

    Red Hat: Improper Removal of Sensitive Information Before Storage or Transfer (CVE-2026-16104)

    Published Last modified Sources: BSI, OSV, CVE.org

    What is affected, what to do

    A flaw was found in the authentication configuration endpoint of the keycloak-services component, which is the core engine for Red Hat Build of Keycloak identity and access management. The issue occurs because the system fails to mask sensitive configuration values, such as reCAPTCHA secret keys, when they are requested by administrators with view-only permissions.

    Update Red Hat build of Keycloak 26.6 to version 26.6.7-3, Red Hat build of Keycloak 26.6 to version 26.6-20.

    Affected
    • Red Hat build of Keycloak 26.6 lt *..26.6.7-3
    • Red Hat build of Keycloak 26.6 lt *..26.6-20
    Fixed in
    • Red Hat build of Keycloak 26.6 26.6.7-3
    • Red Hat build of Keycloak 26.6 26.6-20

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    6.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    4.3

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: BSI, OSV, CVE.org

    0.5 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 39.3

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    54.89 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    6.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    4.3
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.5 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    39.3
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-212

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A flaw was found in the authentication configuration endpoint of the keycloak-services component, which is the core engine for Red Hat Build of Keycloak identity and access management. The issue occurs because the system fails to mask sensitive configuration values, such as reCAPTCHA secret keys, when they are requested by administrators with view-only permissions. This can lead to the exposure of third-party service credentials to unauthorized personnel or through administrative logs.

    Source: BSI WID Portal, BSI CSAF, OSV (Open Source Vulnerabilities), cvelistv5, NVD (NIST)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    Red HatRed Hat build of Keycloak 26.6
    • < 26.6-20
    • < 26.6.7-3
    • 26.6-20
    • 26.6.7-3
    Red HatRed Hat build of Keycloak 26.6.7
    • —
    • —
    Red HatRed Hat Data Grid 8
    • —
    • —
    Red HatRed Hat JBoss Enterprise Application Platform Expansion Pack
    • —
    • —
    Red HatRed Hat Single Sign-On 7
    • —
    • —
    redhatbuild_of_keycloak
    • —
    • —
    Distribution and container packages (1)

    Downstream packages (e.g. Bitnami, Debian, Ubuntu, Red Hat). Versions refer to the distribution, not the vendor.

    Distribution and container packages
    Affected versionsFixed in
    bitnamikeycloak
    • —
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-212Improper Removal of Sensitive Information Before Storage or Transfer

      Base

      The product stores, transfers, or shares a resource that contains sensitive information, but it does not properly remove that information before the product makes the resource available to unauthorized actors.

      Entry at MITRE CWE-212

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedRed Hat

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/16xxx/CVE-2026-16104.json">CVE-2026-16104</a>

      Source identifier: secalert@redhat.com

    2. Record modifiedRed Hat

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/16xxx/CVE-2026-16104.json">CVE-2026-16104</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:68277
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:68278

      Source identifier: secalert@redhat.com

    3. Record modifiedRed Hat

      Weakness type: CWE-212

      Show 7 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-212
      Referenceadded
      —
      https://access.redhat.com/security/cve/CVE-2026-16104
      Referenceadded
      —
      https://bugzilla.redhat.com/show_bug.cgi?id=2501737
      Referenceremoved
      https://access.redhat.com/security/cve/CVE-2026-16104
      —
      Referenceremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2501737
      —
      Reference typeremoved
      https://access.redhat.com/security/cve/CVE-2026-16104 Types: Vendor Advisory
      —
      Reference typeremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2501737 Types: Issue Tracking, Vendor Advisory
      —

      Source identifier: secalert@redhat.com

    4. Initial analysis by NVDNVD

      Newly listed as affected:

      CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
      Product configurationadded
      —
      OR *cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*
      Reference typeadded
      —
      Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-16104 Types: Vendor Advisory
      Reference typeadded
      —
      Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2501737 Types: Issue Tracking, Vendor Advisory

      Source identifier: nvd@nist.gov

    5. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: no

      Weakness type: CWE-522

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Weakness type (CWE)added
      —
      CWE-522
      SSVC assessmentadded
      —
      {"id":"CVE-2026-16104","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-07-17T17:24:30.498422Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Show one older change

    1. ReceivedRed Hat

      CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

      Description added or changed

      Show 5 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Red Hat Build of Keycloak, Red Hat Build of Keycloak, Red Hat Build of Keycloak (+3)
      Descriptionadded
      —
      A flaw was found in the authentication configuration endpoint of the keycloak-services component, which is the core engine for Red Hat Build of Keycloak identity and access management. The issue occurs because the system fails to mask sensitive configuration values, such as reCAPTCHA secret keys, when they are requested by administrators with view-only permissions. This can lead to the exposure of third-party service credentials to unauthorized personnel or through administrative logs.
      CVSSadded
      —
      AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
      Referenceadded
      —
      https://access.redhat.com/security/cve/CVE-2026-16104
      Referenceadded
      —
      https://bugzilla.redhat.com/show_bug.cgi?id=2501737

      Source identifier: secalert@redhat.com

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