CriticalCVE-2026-77459

    Argoproj Argo-cd: Incorrect Authorization (CVE-2026-77459)

    Published Last modified Sources: CVE.org, OSV, Hersteller, BSI, Red Hat

    What is affected, what to do

    A flaw was found in argo-cd. PreDelete and PostDelete resource hooks bypass AppProject security policies that restrict destination servers, namespaces, and permitted resource types.

    Update Argo CD to version 3.4.10, github.com/argoproj/argo-cd/v3 to version 3.5.4.

    Affected
    • Argoproj Argo-cd gte 2.10.0, <= 2.14.21..*

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

    Metrics

    9.9

    Priority

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

    Source: Vendor (CNA), CVSS v3

    9.9

    CVSS v3

    Severity Critical on the scale from 0 to 10.

    Source: CVE.org, OSV, Hersteller, BSI, Red Hat

    0.5 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 42.4

    Show all metrics
    Severity
    Critical
    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
    93.92 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
    9.9 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
    9.9
    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“.

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    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.

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    42.4
    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-863

    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

    A flaw was found in argo-cd. PreDelete and PostDelete resource hooks bypass AppProject security policies that restrict destination servers, namespaces, and permitted resource types. An authenticated attacker with write access to a linked Git repository can commit malicious delete hooks, which Argo CD executes using the controller's elevated cluster credentials upon application deletion. This flaw allows an attacker to achieve privilege escalation by creating unauthorized resources across restricted namespaces or the entire cluster.

    Source: NVD (NIST), OSV (Open Source Vulnerabilities), GitHub Security Advisories, CVE.org (MITRE), cvelistv5, BSI WID Portal, BSI CSAF, redhat_csaf

    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
    argoprojargo-cd
    • ≥ 2.10.0, <= 2.14.21
    • —
    Open SourceArgo CD
    • < 3.4.10
    • < 3.5.4
    • < 3.6.0-rc2
    • < 3.3.15
    • 3.4.10
    • 3.5.4
    • 3.6.0-rc2
    • 3.3.15
    gogithub.com/argoproj/argo-cd
    • —
    • —
    gogithub.com/argoproj/argo-cd/v2
    • 2.10.0
    • —
    gogithub.com/argoproj/argo-cd/v3
    • 3.5.0
    • 3.6.0-rc1
    • 3.4.0
    • 3.0.0
    • 3.5.4
    • 3.6.0-rc2
    • 3.4.10
    • 3.3.15
    Distribution and container packages (3)

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

    Distribution and container packages
    Affected versionsFixed in
    bitnamiargo-cd
    • 2.10.0
    • 3.4.0
    • 3.5.0
    • 3.3.15
    • 3.4.10
    • 3.5.4

    Vendors and products

    Weakness classes (CWE)

    • CWE-863Incorrect Authorization

      Class

      The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

      Entry at MITRE CWE-863

    References & sources

    • github.comargoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wpx_refsource_CONFIRM, web, advisory
    • github.comargoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940cx_refsource_MISC, web, fix
    • github.comargoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511x_refsource_MISC, web, fix
    • github.comargoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696x_refsource_MISC, web, fix
    • github.comargoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4x_refsource_MISC, web, fix
    • github.comargoproj/argo-cd/releases/tag/v3.3.15x_refsource_MISC, web
    • github.comargoproj/argo-cd/releases/tag/v3.4.10x_refsource_MISC, web
    • github.comargoproj/argo-cd/releases/tag/v3.5.4x_refsource_MISC, web
    • github.comargoproj/argo-cd/releases/tag/v3.6.0-rc2x_refsource_MISC, web
    • NVD (NIST)vuln/detail/CVE-2026-77459advisory, web
    • github.comargoproj/argo-cdpackage

    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-2026-77459","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-14T15:27:27.557503Z"}

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

    2. ReceivedGitHub

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

      Weakness type: CWE-863

      Description added or changed

      Show 13 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From 2.10.0 until 3.3.15, 3.4.10, 3.5.4, and 3.6.0-rc2, Argo CD creates PostDelete resource hooks without applying the AppProject destination and resource authorization checks used during ordinary synchronization. The omitted checks include cluster-scoped and namespaced resource allow/deny lists. A user who can write to an Application's Git repository can commit a delete hook targeting a forbidden namespace, server, group, kind, or resource name, and deletion of the Application causes the application-controller to create that resource with its destination-cluster credentials. The reachable impact is bounded by the controller's cluster access but can include cluster-scoped resources, disallowed namespaces, persistent hook objects, and secondary objects created by a hook Job. PreSync, Sync, PostSync, and SyncFail hooks continue to use the normal project checks. This issue is fixed in versions 3.3.15, 3.4.10, 3.5.4, and 3.6.0-rc2.
      CVSSadded
      —
      AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
      Weakness type (CWE)added
      —
      CWE-863
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/77xxx/CVE-2026-77459.json">CVE-2026-77459</a>
      Referenceadded
      —
      https://github.com/argoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940c
      Referenceadded
      —
      https://github.com/argoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511
      Referenceadded
      —
      https://github.com/argoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696
      Referenceadded
      —
      https://github.com/argoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4
      Referenceadded
      —
      https://github.com/argoproj/argo-cd/releases/tag/v3.3.15
      Referenceadded
      —
      https://github.com/argoproj/argo-cd/releases/tag/v3.4.10
      Referenceadded
      —
      https://github.com/argoproj/argo-cd/releases/tag/v3.5.4
      Referenceadded
      —
      https://github.com/argoproj/argo-cd/releases/tag/v3.6.0-rc2
      Referenceadded
      —
      https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp

      Source identifier: security-advisories@github.com

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