HighCVE-2026-86492

    YouTrack: Exposure of Data Element to Wrong Session (CVE-2026-86492)

    Published Sources: BSI

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    What is affected, what to do

    In JetBrains YouTrack before 2026.2.18634 a shared token cache allowed cross-tenant theft of GitHub App installation tokens

    Update JetBrains YouTrack to version 2026.2.18634.

    Affected
    • JetBrains YouTrack lt *..2026.2.18634
    Fixed in
    • JetBrains YouTrack 2026.2.18634

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

    Metrics

    8.5

    XIEM Effective CVSS

    Highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v3

    8.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: BSI

    0.9 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 60.2

    Show all metrics
    Severity
    High
    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
    61.54 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
    8.5 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
    8.5
    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
    0.9 %
    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
    60.2
    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
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 8 September 2026
    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-488

    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
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    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

    In JetBrains YouTrack before 2026.2.18634 a shared token cache allowed cross-tenant theft of GitHub App installation tokens

    Source: BSI WID Portal

    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
    JetBrainsYouTrack
    • 2026.1 – < 2026.1.14042
    • 2026.1 – < 2026.1.14047
    • 2026.1 – < 2026.1.14055
    • 2026.2 – < 2026.2.18788
    • < 2025.3.160480
    • < 2025.3.161254
    • < 2026.1.14047
    • < 2026.2.18634
    • < 2026.2.18687
    • < 2026.2.18769
    • 2026.1.14042
    • 2026.1.14047
    • 2026.1.14055
    • 2026.2.18788
    • 2025.3.160480
    • 2025.3.161254
    • 2026.1.14047
    • 2026.2.18634
    • 2026.2.18687
    • 2026.2.18769
    JetBrainsYou Track
    • < 2025.3.160480
    • < 2025.3.161254
    • < 2026.1.14042
    • < 2026.1.14047
    • < 2026.1.14055
    • < 2026.2.18634
    • < 2026.2.18788
    • 2025.3.160480
    • 2025.3.161254
    • 2026.1.14042
    • 2026.1.14047
    • 2026.1.14055
    • 2026.2.18634
    • 2026.2.18788

    Vendors and products

    Affected operating systems

    Affected operating systems
    LinuxLinux—
    OtherSonstiges—
    LinuxUNIX—
    WindowsWindows—

    Weakness classes (CWE)

    • CWE-488Exposure of Data Element to Wrong Session

      Base

      The product does not sufficiently enforce boundaries between the states of different sessions, causing data to be provided to, or used by, the wrong session.

      Entry at MITRE CWE-488

    References & sources

    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI
    • NVD (NIST)NIST Vunerability Database vom 2026-09-07BSI

    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 modifiedCISA ADP

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

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-86492","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-09-08T10:14:31.289736Z"}

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

    2. Receivedjetbrains.com

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

      Weakness type: CWE-488

      Description added or changed

      Show 5 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      In JetBrains YouTrack before 2026.2.18634 a shared token cache allowed cross-tenant theft of GitHub App installation tokens
      CVSSadded
      —
      AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
      Weakness type (CWE)added
      —
      CWE-488
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/86xxx/CVE-2026-86492.json">CVE-2026-86492</a>
      Referenceadded
      —
      https://www.jetbrains.com/privacy-security/issues-fixed/

      Source identifier: cve@jetbrains.com

    Linked CVEs

    Linked CVEs
    MediumCVE-2026-86500JetBrains YouTrack: Incorrect Privilege Assignment5.5—
    MediumCVE-2026-86499JetBrains YouTrack: Missing Authorization4.3—
    HighCVE-2026-86498JetBrains YouTrack: Incorrect Authorization7.7—
    MediumCVE-2026-86497JetBrains YouTrack: Insertion of Sensitive Information Into Sent Data6.8—
    MediumCVE-2026-86496JetBrains YouTrack: Missing Authorization4.3—
    MediumCVE-2026-86495JetBrains YouTrack: Missing Authorization6.5—
    HighCVE-2026-86494JetBrains YouTrack: Missing Authorization7.7—
    MediumCVE-2026-86493JetBrains YouTrack: Incorrect Authorization6.5—
    HighCVE-2026-86492JetBrains YouTrack: Exposure of Data Element to Wrong Session8.5—
    LowCVE-2026-86491JetBrains YouTrack: Cross-site Scripting3.5—
    MediumCVE-2026-86490JetBrains YouTrack: Incorrect Authorization6.5—
    MediumCVE-2026-86489JetBrains YouTrack: Authorization Bypass Through User-Controlled Key6.5—
    MediumCVE-2026-86488JetBrains YouTrack: Authorization Bypass Through User-Controlled Key6.5—
    LowCVE-2026-86487JetBrains YouTrack: Incorrect Authorization3.1—
    LowCVE-2026-86486JetBrains YouTrack: Missing Authentication for Critical Function3.7—
    LowCVE-2026-86485JetBrains YouTrack: Reliance on IP Address for Authentication3.5—
    MediumCVE-2026-86484JetBrains YouTrack: Cross-site Scripting4.6—
    MediumCVE-2026-86483JetBrains YouTrack: Cross-site Scripting5.4—
    HighCVE-2026-86482JetBrains YouTrack: Incorrect Privilege Assignment8.8—
    MediumCVE-2026-86481JetBrains YouTrack: Authorization Bypass Through User-Controlled Key4.3—
    HighCVE-2026-86479JetBrains YouTrack: Missing Authorization8.0—
    CriticalCVE-2026-86478JetBrains YouTrack: Authentication Bypass by Spoofing9.8—
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    Badge preview for CVE-2026-86492
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-86492"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-86492.svg?lang=en" alt="CVE-2026-86492 – NEOSEC Intel" height="20"></a>