CVE-2026-43986Public exploitNetwork attack vector

Unauthenticated SSRF via attacker-seeded image hash replay

Published Jun 4, 2026 · Updated Jun 4, 2026

Server-side request forgery in Tautulli before 2.17.1 allows remote authenticated users to make the server fetch arbitrary URLs. The public /image/{hash} route trusts a stored image_hash_lookup row and replays its attacker-controlled URL through real_pms_image_proxy with server-side credentials. Guest access must be enabled, and a low-privilege guest must first seed the row; remote attackers can then trigger repeat fetches that reach internal resources or disclose data.

CVSS severity9.9
Critical
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Tautulli before 2.17.1 allows remote authenticated users to make the server fetch arbitrary URLs. The public /image/{hash} route trusts a stored image_hash_lookup row and replays its attacker-controlled URL through real_pms_image_proxy with server-side credentials. Guest access must be enabled, and a low-privilege guest must first seed the row; remote attackers can then trigger repeat fetches that reach internal resources or disclose data.

The record

CVE
CVE-2026-43986
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Tautulli
Product
Tautulli
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 2.17.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tautulli · Tautulliversion=< 2.17.1

Published CVSS scores

9.9GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

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Technologies

Your stack

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Your stack

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