FKIE_CVE-2026-66885

Vulnerability from fkie_nvd - Published: 2026-08-05 20:17 - Updated: 2026-08-10 16:52
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Summary
Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity. When Livebook is configured to use Livebook Teams for identity, Livebook.ZTA.LivebookTeams.handle_request/4 in lib/livebook/zta/livebook_teams.ex handles the OAuth-style callback carrying a teams_identity marker and a code parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No state or nonce is generated when the flow is initiated: Livebook.Teams.Requests.create_auth_request/1 in lib/livebook/teams/requests.ex sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against. An attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the resulting session is bound to the attacker's identity rather than the victim's. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim. The consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker's account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim's own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility. This issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9.
References
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://cna.erlef.org/cves/CVE-2026-66885.htmlVendor Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/livebook-dev/livebook/commit/21c16168263275541a6e076d0c31852c40e09a18Patch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/livebook-dev/livebook/commit/33a052daa386c4ce08a9c39a07fc90f353ff6a51Patch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/livebook-dev/livebook/commit/6ed2e213e9d5a19a70d7fcad5a8d616622cd2084Patch
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://github.com/livebook-dev/livebook/security/advisories/GHSA-pvvw-28fw-c6fgVendor Advisory
6b3ad84c-e1a6-4bf7-a703-f496b71e49dbhttps://osv.dev/vulnerability/EEF-CVE-2026-66885Third Party Advisory
Impacted products
Vendor Product Version
livebook livebook *
livebook livebook *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "Elixir.Livebook.ZTA.LivebookTeams",
            "Elixir.Livebook.Teams.Requests"
          ],
          "packageName": "livebook",
          "packageURL": "pkg:hex/livebook",
          "product": "livebook",
          "programFiles": [
            "lib/livebook/zta/livebook_teams.ex",
            "lib/livebook/teams/requests.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Livebook.ZTA.LivebookTeams\u0027:handle_request/4"
            },
            {
              "name": "\u0027Elixir.Livebook.Teams.Requests\u0027:create_auth_request/1"
            }
          ],
          "repo": "https://github.com/livebook-dev/livebook",
          "vendor": "livebook-dev",
          "versions": [
            {
              "lessThan": "0.18.7",
              "status": "affected",
              "version": "0.15.0",
              "versionType": "semver"
            },
            {
              "lessThan": "0.19.9",
              "status": "affected",
              "version": "0.19.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://ghcr.io",
          "cpes": [
            "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "Elixir.Livebook.ZTA.LivebookTeams",
            "Elixir.Livebook.Teams.Requests"
          ],
          "packageName": "livebook-dev/livebook",
          "packageURL": "pkg:oci/livebook?repository_url=ghcr.io%2Flivebook-dev",
          "product": "livebook",
          "programFiles": [
            "lib/livebook/zta/livebook_teams.ex",
            "lib/livebook/teams/requests.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Livebook.ZTA.LivebookTeams\u0027:handle_request/4"
            },
            {
              "name": "\u0027Elixir.Livebook.Teams.Requests\u0027:create_auth_request/1"
            }
          ],
          "vendor": "livebook-dev",
          "versions": [
            {
              "lessThan": "0.18.7",
              "status": "affected",
              "version": "0.15.0",
              "versionType": "other"
            },
            {
              "lessThan": "0.19.9",
              "status": "affected",
              "version": "0.19.0",
              "versionType": "other"
            },
            {
              "lessThan": "0.18.7-cuda12",
              "status": "affected",
              "version": "0.15.0-cuda12",
              "versionType": "other"
            },
            {
              "lessThan": "0.19.9-cuda12",
              "status": "affected",
              "version": "0.19.0-cuda12",
              "versionType": "other"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "Elixir.Livebook.ZTA.LivebookTeams",
            "Elixir.Livebook.Teams.Requests"
          ],
          "packageName": "livebook-dev/livebook",
          "packageURL": "pkg:github/livebook-dev/livebook",
          "product": "livebook",
          "programFiles": [
            "lib/livebook/zta/livebook_teams.ex",
            "lib/livebook/teams/requests.ex"
          ],
          "programRoutines": [
            {
              "name": "\u0027Elixir.Livebook.ZTA.LivebookTeams\u0027:handle_request/4"
            },
            {
              "name": "\u0027Elixir.Livebook.Teams.Requests\u0027:create_auth_request/1"
            }
          ],
          "repo": "https://github.com/livebook-dev/livebook",
          "vendor": "livebook-dev",
          "versions": [
            {
              "changes": [
                {
                  "at": "21c16168263275541a6e076d0c31852c40e09a18",
                  "status": "unaffected"
                },
                {
                  "at": "33a052daa386c4ce08a9c39a07fc90f353ff6a51",
                  "status": "unaffected"
                },
                {
                  "at": "6ed2e213e9d5a19a70d7fcad5a8d616622cd2084",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "4380a411920531223088267ed1c0ad21f96ef660",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:livebook:livebook:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D2DF96B1-E7BE-4B24-9D03-1D53FEA54376",
              "versionEndExcluding": "0.18.7",
              "versionStartIncluding": "0.15.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:livebook:livebook:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7B4998A3-46BF-4E69-8642-1156BB3E7480",
              "versionEndExcluding": "0.19.9",
              "versionStartIncluding": "0.19.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim\u0027s browser session under the attacker\u0027s own Livebook Teams identity.\n\nWhen Livebook is configured to use Livebook Teams for identity, Livebook.ZTA.LivebookTeams.handle_request/4 in lib/livebook/zta/livebook_teams.ex handles the OAuth-style callback carrying a teams_identity marker and a code parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No state or nonce is generated when the flow is initiated: Livebook.Teams.Requests.create_auth_request/1 in lib/livebook/teams/requests.ex sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against.\n\nAn attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim\u0027s browser completes the exchange and the resulting session is bound to the attacker\u0027s identity rather than the victim\u0027s. The victim is not required to hold any particular privilege, and no credential belonging to the victim is involved. The vulnerability does not allow the attacker to authenticate as the victim.\n\nThe consequence is that a user believes they are working in their own authenticated session while they are in fact operating as another identity. Work performed in that session is attributed to the attacker\u0027s account, and secrets, uploaded data, or notebook results the victim produces are exposed to the attacker rather than kept in the victim\u0027s own account. The authorization code must be redeemed within a short window after the login flow begins, which constrains the timing of the attack but not its feasibility.\n\nThis issue affects livebook: from 0.15.0 before 0.18.7 and from 0.19.0 before 0.19.9."
    }
  ],
  "id": "CVE-2026-66885",
  "lastModified": "2026-08-10T16:52:00.830",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "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": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/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": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-66885",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-06T13:09:14.330707Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-05T20:17:13.007",
  "references": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://cna.erlef.org/cves/CVE-2026-66885.html"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/livebook-dev/livebook/commit/21c16168263275541a6e076d0c31852c40e09a18"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/livebook-dev/livebook/commit/33a052daa386c4ce08a9c39a07fc90f353ff6a51"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/livebook-dev/livebook/commit/6ed2e213e9d5a19a70d7fcad5a8d616622cd2084"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/livebook-dev/livebook/security/advisories/GHSA-pvvw-28fw-c6fg"
    },
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-66885"
    }
  ],
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-352"
        }
      ],
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.