CVE-2026-104976 (GCVE-0-2026-104976)

Vulnerability from cvelistv5 – Published: 2026-10-05 17:45 – Updated: 2026-10-05 17:45
VLAI
Title
Plane: SSRF in Gitea OAuth
Summary
Plane is an open-source project management tool. Prior to 1.4.0, Plane validates GITEA_HOST only for its URL scheme and does not reject hosts that resolve to private or internal IP addresses. The four outbound requests in the Gitea OAuth flow are derived from this unvalidated host and do not call validate_url(). In addition, avatar_url is taken from the Gitea user's profile, where users can configure external avatar URLs. After an administrator enables Gitea OAuth for a legitimate instance, a Gitea user can set an internal URL as the profile avatar and log in through Gitea, causing Plane to fetch the internal target without validation. This issue is fixed in 1.4.0.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
makeplane plane Affected: < 1.4.0
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        }
      ],
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            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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      "providerMetadata": {
        "dateUpdated": "2026-10-05T17:45:43.115Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/makeplane/plane/security/advisories/GHSA-hx79-5pj5-qh42",
          "tags": [
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          "tags": [
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          "url": "https://github.com/makeplane/plane/pull/9163"
        },
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          "name": "https://github.com/makeplane/plane/commit/04622ce1188c4680951f0001e35efb342fe51615",
          "tags": [
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          "url": "https://github.com/makeplane/plane/commit/04622ce1188c4680951f0001e35efb342fe51615"
        },
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          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/makeplane/plane/releases/tag/v1.4.0"
        }
      ],
      "source": {
        "advisory": "GHSA-hx79-5pj5-qh42",
        "discovery": "UNKNOWN"
      },
      "title": "Plane: SSRF in Gitea OAuth"
    }
  },
  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-104976",
    "datePublished": "2026-10-05T17:45:43.115Z",
    "dateReserved": "2026-10-02T18:16:13.629Z",
    "dateUpdated": "2026-10-05T17:45:43.115Z",
    "state": "PUBLISHED"
  },
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                "vendor": "makeplane",
                "versions": [
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                    "status": "affected",
                    "version": "\u003c 1.4.0"
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            "source": "security-advisories@github.com"
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        ],
        "cveTags": [],
        "descriptions": [
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            "value": "Plane is an open-source project management tool. Prior to 1.4.0, Plane validates GITEA_HOST only for its URL scheme and does not reject hosts that resolve to private or internal IP addresses. The four outbound requests in the Gitea OAuth flow are derived from this unvalidated host and do not call validate_url(). In addition, avatar_url is taken from the Gitea user\u0027s profile, where users can configure external avatar URLs. After an administrator enables Gitea OAuth for a legitimate instance, a Gitea user can set an internal URL as the profile avatar and log in through Gitea, causing Plane to fetch the internal target without validation. This issue is fixed in 1.4.0."
          }
        ],
        "id": "CVE-2026-104976",
        "lastModified": "2026-10-05T18:17:33.037",
        "metrics": {
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                "Recovery": "NOT_DEFINED",
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                "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:L/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",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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    }
  }
}



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