CVE-2026-54915Public exploitNetwork attack vectorHinoki check available

Open redirect via whitespace bypass in /auth/redirect

Published Sep 21, 2026 · Updated Sep 21, 2026

Open redirect in Tautulli 2.17.1 and earlier allows remote attackers to send users to external sites through a crafted link. The unauthenticated /auth/redirect endpoint removes forward slashes from redirect_uri but leaves tabs and line breaks, allowing CherryPy's urljoin processing to resolve the target to an attacker-controlled origin. Exploitation requires a user to follow the link and the default root HTTP_ROOT configuration; custom non-root configurations are not affected.

CVSS severity5.4
Medium
EPSS probability0.26%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Open redirect in Tautulli 2.17.1 and earlier allows remote attackers to send users to external sites through a crafted link. The unauthenticated /auth/redirect endpoint removes forward slashes from redirect_uri but leaves tabs and line breaks, allowing CherryPy's urljoin processing to resolve the target to an attacker-controlled origin. Exploitation requires a user to follow the link and the default root HTTP_ROOT configuration; custom non-root configurations are not affected.

The record

CVE
CVE-2026-54915
Published
Sep 21, 2026
Updated
Sep 21, 2026
Vendor
Tautulli
Product
Tautulli
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.17.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tautulli · Tautulliversion=< 2.17.2

Published CVSS scores

5.4GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started