CVE-2026-43984

HIGHPre-NVD 8.98.9—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 89% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 expose log_js_errors to any authenticated user, including guest users when guest access is enabled. The endpoint writes attacker-controlled strings directly into the main application log. The administrator-only logFile view then reads that log file and embeds it into an HTML response without escaping. This creates a stored cross-site scripting condition where a low-privilege guest can inject HTML or JavaScript into the log file and have it execute in an administrator's browser when the log viewer is opened. Version 2.17.1 patches the issue.

CVSS v3
8.9
EG Score
8.9(medium)
EPSS
10.8%
KEV
Not listed

Published

June 4, 2026

Last Modified

June 4, 2026

Advisory Details (2)

Auto-updated Jun 4, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github.
github Patch Available🟡 PoC Available

Stored XSS in logFile via guest-controlled log_js_errors input · Advisory · Tautulli/Tautulli · GitHub

https://github.com/Tautulli/Tautulli/security/advisories/GHSA-f4j7-pjwc-4jrr
github_release Patch Available

Tautulli v2.17.1

Patch available: Tautulli/Tautulli v2.17.1

https://github.com/Tautulli/Tautulli/releases/tag/v2.17.1

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 66× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 103 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-14 16:26 UTCEG score recompute
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  1. 2026-06-30 23:22 UTCEPSS rescore
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  44. 2026-06-15 08:13 UTCEG score recompute
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  47. 2026-06-13 23:00 UTCEPSS rescore
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  60. 2026-06-10 12:35 UTCEG score recompute
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  70. 2026-06-07 07:44 UTCEG score recompute
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  72. 2026-06-06 13:47 UTCEPSS rescore
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  74. 2026-06-06 06:07 UTCEG score recompute
  75. 2026-06-05 22:47 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-43984?
CVE-2026-43984 is a high vulnerability published on June 4, 2026. Tautulli is a Python based monitoring and tracking tool for Plex Media Server. Versions prior to 2.17.1 expose logjserrors to any authenticated user, including guest users when guest access is enabled. The endpoint writes attacker-controlled strings directly into the main application log. The…
When was CVE-2026-43984 disclosed?
CVE-2026-43984 was first published in the National Vulnerability Database on June 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43984 actively exploited?
CVE-2026-43984 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43984?
CVE-2026-43984 has a CVSS v3 base score of 8.9 (NVD).
How do I remediate CVE-2026-43984?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43984, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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