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Medium

Tautulli: Open redirect via whitespace bypass in /auth/redirect

Type: advisorySources: OSV

Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Prior to 2.17.2, the unauthenticated /auth/redirect endpoint in plexpy/webauth.py removes forward slashes from the user-controlled redirect_uri parameter but leaves tab, line-feed, and carriage-return characters intact. With the default root HTTP_ROOT configuration, CherryPy HTTPRedirect passes the resulting value to urllib.parse.urljoin, which can resolve the whitespace-bearing path to an attacker-controlled external origin. A user who follows a crafted link can therefore be redirected outside Tautulli for phishing or post-login redirect-flow abuse, while custom non-root HTTP_ROOT configurations are not affected by this bypass. This issue is fixed in version 2.17.2.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-54915
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 02:20 UTC · Revision 1

Source evidence

Tautulli: Open redirect via whitespace bypass in /auth/redirect

core-osv · Original source

Published 21 Sept 2026, 19:09 UTC

Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Prior to 2.17.2, the unauthenticated /auth/redirect endpoint in plexpy/webauth.py removes forward slashes from the user-controlled redirect_uri parameter but leaves tab, line-feed, and carriage-return characters intact. With the default root HTTP_ROOT configuration, CherryPy HTTPRedirect passes the resulting value to urllib.parse.urljoin, which can resolve the whitespace-bearing path to an attacker-controlled external origin. A user who follows a crafted link can therefore be redirected outside Tautulli for phishing or post-login redirect-flow abuse, while custom non-root HTTP_ROOT configurations are not affected by this bypass. This issue is fixed in version 2.17.2.

osv:CVE-2026-54915
Complete source record
{
  "id": "3b29f1be11664fd78e723858f3af455d350cadc9371fa68cccfff5480239fedf",
  "url": "https://osv.dev/vulnerability/CVE-2026-54915",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Tautulli: Open redirect via whitespace bypass in /auth/redirect",
    "summary": "Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Prior to 2.17.2, the unauthenticated /auth/redirect endpoint in plexpy/webauth.py removes forward slashes from the user-controlled redirect_uri parameter but leaves tab, line-feed, and carriage-return characters intact. With the default root HTTP_ROOT configuration, CherryPy HTTPRedirect passes the resulting value to urllib.parse.urljoin, which can resolve the whitespace-bearing path to an attacker-controlled external origin. A user who follows a crafted link can therefore be redirected outside Tautulli for phishing or post-login redirect-flow abuse, while custom non-root HTTP_ROOT configurations are not affected by this bypass. This issue is fixed in version 2.17.2.",
    "evidence": "osv:CVE-2026-54915",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-54915",
      "aliases": [
        "CVE-2026-54915",
        "GHSA-7c9r-fhj9-87xm"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tautulli/tautulli",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c7153deb6e3017b8dda46c8448fe548a61c5a47a"
                },
                {
                  "fixed": "07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.17.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c7153deb6e3017b8dda46c8448fe548a61c5a47a"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.17.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.17.1",
            "v2.17.0",
            "v2.16.1",
            "v2.16.0",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54915.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.996708128Z",
      "provider": "osv",
      "references": [
        "https://github.com/Tautulli/Tautulli/releases/tag/v2.17.2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54915.json",
        "https://github.com/Tautulli/Tautulli/security/advisories/GHSA-7c9r-fhj9-87xm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54915",
        "https://github.com/Tautulli/Tautulli/commit/07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-601"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54915.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54915",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514230,
  "published_at": "2026-09-21T19:09:55.649+00:00"
}