CVE-2026-54915

Description

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: MEDIUM
CVSS score: 5.4 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Effective score: 5.4 / 10 MEDIUM source: CNA overview
CWE(s): CWE-601
Reserved: 2026-06-16
Published: 2026-09-21 19:09 UTC
Last updated: 2026-09-21 19:09 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/54xxx/CVE-2026-54915.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-21 20:17:26 UTC
NVD last modified: 2026-09-21 20:17:26 UTC
NVD CVSS v3.1: 5.4 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Exploitability subscore: 2.8 / 10
Impact subscore: 2.5 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84068
Assigner: GitHub_M
Published: Sep 21, 2026, 7:09:55 PM
Updated: Sep 21, 2026, 7:09:55 PM
EUVD base score (CVSS 3.1): 5.4 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EUVD-reported EPSS: 0.0000
Vendors: Tautulli
Products: Tautulli (< 2.17.2)

ENISA description: 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.

EUVD references (3)

Affected products (1)

Vendor	Product	Versions	Platforms
Tautulli	Tautulli	`< 2.17.2` (affected)	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

https://github.com/Tautulli/Tautulli/security/advisories/GHSA-7c9r-fhj9-87xm x_refsource_CONFIRM
https://github.com/Tautulli/Tautulli/commit/07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd x_refsource_MISC
https://github.com/Tautulli/Tautulli/releases/tag/v2.17.2 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/Tautulli/Tautulli/commit/07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd security-advisories@github.com
https://github.com/Tautulli/Tautulli/releases/tag/v2.17.2 security-advisories@github.com
https://github.com/Tautulli/Tautulli/security/advisories/GHSA-7c9r-fhj9-87xm security-advisories@github.com

Remediations (10)

CISA Requires Federal Agencies to Patch Critical Vulnerabilities Within ...

web:cybersecuritynews.com

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued Binding Operational Directive (BOD) 26-04, titled "Prioritizing Security Updates Based on Risk," compelling all Federal Civilian Executive Branch (FCEB) agencies to remediate the most dangerous known exploited vulnerabilities within just three calendar days.

2026-09-22 17:11 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-22 17:11 UTC
Nvd-cve-2025-54915

web:nvd.nist.gov

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

2026-09-22 17:11 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-22 17:11 UTC
Description of the security update for Microsoft Exchange Server ...

web:support.microsoft.com

This security update resolves vulnerabilities in Microsoft Exchange Server. To learn more about these vulnerabilities, see the following Common Vulnerabilities and Exposures ( CVE ): CVE - 2026 -62910 - Microsoft Common Vulnerabilities and Exposures CVE - 2026 -62911 - Microsoft Common Vulnerabilities and Exposures CVE - 2026 -62912 - Microsoft Common Vulnerabilities and Exposures CVE - 2026 -62913 ...

2026-09-22 17:11 UTC
What Is CVE Remediation in 2026? - aikido.dev

web:www.aikido.dev

None of these is a clean fix , which is why the decision on how to remediate depends on knowing what package versions are running in production and why. This post will cover how AI has accelerated CVE detection and discovery, the upgrade trap, what CVE remediation actually involves in 2026 , and how to solve the CVE remediation problem.

2026-09-22 17:11 UTC
August's Patch Tuesday is a monster: 751 fixes, with an exploited ...

web:www.computerworld.com

August's Patch Tuesday is a big one: 751 fixes, an exploited WinSock flaw and plenty of critical Windows, Office and Exchange issues.

2026-09-22 17:11 UTC
National Vulnerability Database | NIST

web:www.nist.gov

NIST maintains the National Vulnerability Database (NVD), a repository of information on software and hardware flaws that can compromise computer security. This is a key piece of the nation's cybersecurity infrastructure.

2026-09-22 17:11 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-22 17:11 UTC
CVE-2026-54915: Tautulli: Tautulli is a Python based ... - Rapid7

web:www.rapid7.com

CVE-2026-54915 : Tautulli: Tautulli is a Python based monitoring and tracking tool for Plex Media Server. View severity, references, and remediation details from Rapid7.

2026-09-22 17:11 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-54915.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Tautulli",
          "vendor": "Tautulli",
          "versions": [
            {
              "status": "affected",
              "version": "< 2.17.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-601",
              "description": "CWE-601: URL Redirection to Untrusted Site ('Open Redirect')",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T19:09:55.649Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Tautulli/Tautulli/security/advisories/GHSA-7c9r-fhj9-87xm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Tautulli/Tautulli/security/advisories/GHSA-7c9r-fhj9-87xm"
        },
        {
          "name": "https://github.com/Tautulli/Tautulli/commit/07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Tautulli/Tautulli/commit/07f9beaa0286f1ab3b5e6be9726c5b2de07ee9dd"
        },
        {
          "name": "https://github.com/Tautulli/Tautulli/releases/tag/v2.17.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Tautulli/Tautulli/releases/tag/v2.17.2"
        }
      ],
      "source": {
        "advisory": "GHSA-7c9r-fhj9-87xm",
        "discovery": "UNKNOWN"
      },
      "title": "Tautulli: Open redirect via whitespace bypass in /auth/redirect"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54915",
    "datePublished": "2026-09-21T19:09:55.649Z",
    "dateReserved": "2026-06-16T13:49:33.556Z",
    "dateUpdated": "2026-09-21T19:09:55.649Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}