Plane has a Server-Side Request Forgery (SSRF) in Favicon Fetching

{
  "id": "c6517df045ef7bb9aaeb1bd2bd34aa9a7c4cdd48eb37f6c5fda5147f6e634b72",
  "url": "https://osv.dev/vulnerability/CVE-2026-39843",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Plane has a Server-Side Request Forgery (SSRF) in Favicon Fetching",
    "summary": "Plane is an an open-source project management tool. From 0.28.0 to before 1.3.0, the remediation of GHSA-jcc6-f9v6-f7jw is incomplete which could lead to the same full read Server-Side Request Forgery when a normal html page contains a link tag with an href that redirects to a private IP address is supplied to Add link by an authenticated attacker with low privileges. Redirects for the main page URL are validated, but not the favicon fetch path. fetch_and_encode_favicon() still uses requests.get(favicon_url, ...) with the default redirect-following. This vulnerability is fixed in 1.3.0.",
    "evidence": "osv:CVE-2026-39843",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-39843",
      "aliases": [
        "CVE-2026-39843",
        "GHSA-9fr2-pprw-pp9j"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/makeplane/plane",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c4d2c5b1bb5225d0caab9b33dd4b11abe00f1869"
                },
                {
                  "fixed": "cf696d200d3e222390a01ba20e833eb11a5ed881"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.28.0"
                      },
                      {
                        "fixed": "1.3.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:plane:plane:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.28.0"
                      },
                      {
                        "fixed": "1.3.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39843.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.768656568Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39843.json",
        "https://github.com/makeplane/plane/security/advisories/GHSA-9fr2-pprw-pp9j",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-39843"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39843.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-39843",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501085,
  "published_at": "2026-04-09T15:43:34.963+00:00"
}