FKIE_CVE-2026-15343

Vulnerability from fkie_nvd - Published: 2026-07-17 16:17 - Updated: 2026-11-03 23:17
Severity
8.6 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Summary
A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an attacker with code execution inside a Dependabot updater container to write files to arbitrary repository paths, including GitHub Actions workflow files under .github/workflows/, because path validation did not check the actual write destination. The initial fix in versions 3.21.3, 3.20.5, 3.19.9, 3.18.12, and 3.17.18 was incomplete because validation checked the supplied symlink target, while the publisher wrote the file using its directory and name. Writing GitHub Actions workflow files required the Dependabot installation to have workflows: write permission. Depending on repository permissions and workflow configuration, including a relevant pull_request_target workflow or auto-merge, an injected workflow could execute with access to GitHub Actions secrets. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.23 and was fully fixed in versions 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.
References
product-cna@github.comhttps://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.18
product-cna@github.comhttps://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.12
product-cna@github.comhttps://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.14
product-cna@github.comhttps://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.9
product-cna@github.comhttps://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.10
product-cna@github.comhttps://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.5
product-cna@github.comhttps://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.3
product-cna@github.comhttps://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.8
product-cna@github.comhttps://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.3
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "Enterprise Server",
          "vendor": "GitHub",
          "versions": [
            {
              "lessThan": "3.17.*",
              "status": "affected",
              "version": "3.17.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.18.*",
              "status": "affected",
              "version": "3.18.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.19.14",
                  "status": "unaffected"
                }
              ],
              "lessThan": "3.19.*",
              "status": "affected",
              "version": "3.19.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.20.10",
                  "status": "unaffected"
                }
              ],
              "lessThan": "3.20.*",
              "status": "affected",
              "version": "3.20.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.21.8",
                  "status": "unaffected"
                }
              ],
              "lessThan": "3.21.*",
              "status": "affected",
              "version": "3.21.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.22.3",
                  "status": "unaffected"
                }
              ],
              "lessThan": "3.22.*",
              "status": "affected",
              "version": "3.22.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "product-cna@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A path traversal vulnerability was identified in GitHub Enterprise Server that allowed an attacker with code execution inside a Dependabot updater container to write files to arbitrary repository paths, including GitHub Actions workflow files under .github/workflows/, because path validation did not check the actual write destination. The initial fix in versions 3.21.3, 3.20.5, 3.19.9, 3.18.12, and 3.17.18 was incomplete because validation checked the supplied symlink target, while the publisher wrote the file using its directory and name. Writing GitHub Actions workflow files required the Dependabot installation to have workflows: write permission. Depending on repository permissions and workflow configuration, including a relevant pull_request_target workflow or auto-merge, an injected workflow could execute with access to GitHub Actions secrets. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.23 and was fully fixed in versions 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de salto de ruta fue identificada en GitHub Enterprise Server que permit\u00eda a un atacante que ten\u00eda ejecuci\u00f3n de c\u00f3digo dentro del contenedor del actualizador de Dependabot escribir archivos en rutas de repositorio arbitrarias, incluyendo archivos de flujo de trabajo de GitHub Actions bajo .github/workflows/, ya que la validaci\u00f3n de ruta no verificaba la ruta efectiva que el atacante pod\u00eda controlar a trav\u00e9s del directorio del archivo de dependencia y el objetivo del enlace simb\u00f3lico. Si el repositorio utilizaba un flujo de trabajo pull_request_target o ten\u00eda la fusi\u00f3n autom\u00e1tica habilitada, un flujo de trabajo inyectado podr\u00eda ejecutarse con acceso a los secretos de GitHub Actions del repositorio. Esta vulnerabilidad afect\u00f3 a todas las versiones de GitHub Enterprise Server anteriores a la 3.22 y fue corregida en las versiones 3.21.3, 3.20.5, 3.19.9, 3.18.12, 3.17.18."
    }
  ],
  "id": "CVE-2026-15343",
  "lastModified": "2026-11-03T23:17:38.267",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "product-cna@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-15343",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-17T16:31:35.938532Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-17T16:17:13.917",
  "references": [
    {
      "source": "product-cna@github.com",
      "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.18"
    },
    {
      "source": "product-cna@github.com",
      "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.12"
    },
    {
      "source": "product-cna@github.com",
      "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.14"
    },
    {
      "source": "product-cna@github.com",
      "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.9"
    },
    {
      "source": "product-cna@github.com",
      "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.10"
    },
    {
      "source": "product-cna@github.com",
      "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.5"
    },
    {
      "source": "product-cna@github.com",
      "url": "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.3"
    },
    {
      "source": "product-cna@github.com",
      "url": "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.8"
    },
    {
      "source": "product-cna@github.com",
      "url": "https://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.3"
    }
  ],
  "sourceIdentifier": "product-cna@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "product-cna@github.com",
      "type": "Secondary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.