CVE-2016-9836

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

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

The file scanning mechanism of JFilterInput::isFileSafe() in Joomla! CMS before 3.6.5 does not consider alternative PHP file extensions when checking uploaded files for PHP content, which enables a user to upload and execute files with the .php6, .php7, .phtml, and .phpt extensions. Additionally, JHelperMedia::canUpload() did not blacklist these file extensions as uploadable file types.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
79%
KEV
Not listed

Published

December 5, 2016

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Sep 22, 2026
No patch confirmed yet.
generic

exploits/Joomraa at master · XiphosResearch/exploits · GitHub

https://github.com/XiphosResearch/exploits/tree/master/Joomraa
generic

CVE-2016-9836 - PSIRT.COM

http://www.securityfocus.com/bid/94663

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 23× 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 158 total refreshes for this CVE.

  1. 2026-09-24 13:59 UTCEPSS rescore
  2. 2026-09-23 13:41 UTCEPSS rescore
  3. 2026-09-20 20:09 UTCEPSS rescore
  4. 2026-09-19 15:35 UTCEPSS rescore
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  1. 2026-08-19 16:59 UTCEPSS rescore
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  10. 2026-08-09 13:42 UTCEPSS rescore
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  24. 2026-07-25 12:41 UTCOSV refresh
  25. 2026-07-24 14:13 UTCEPSS rescore
  26. 2026-07-23 14:15 UTCEPSS rescore
  27. 2026-07-23 01:24 UTCEG score recompute
  28. 2026-07-22 22:04 UTCEG score recompute
  29. 2026-07-22 14:04 UTCEPSS rescore
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  48. 2026-07-11 08:24 UTCEPSS rescore
  49. 2026-07-09 19:06 UTCEPSS rescore
  50. 2026-07-08 15:10 UTCEPSS rescore
  51. 2026-07-08 07:05 UTCOSV refresh
  52. 2026-07-07 13:42 UTCEPSS rescore
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  65. 2026-06-27 03:05 UTCEPSS rescore
  66. 2026-06-25 13:47 UTCEPSS rescore
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  74. 2026-06-19 19:23 UTCEPSS rescore
  75. 2026-06-19 19:23 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2016-9836?
CVE-2016-9836 is a critical vulnerability published on December 5, 2016. The file scanning mechanism of JFilterInput::isFileSafe() in Joomla! CMS before 3.6.5 does not consider alternative PHP file extensions when checking uploaded files for PHP content, which enables a user to upload and execute files with the .php6, .php7, .phtml, and .phpt extensions. Additionally,…
When was CVE-2016-9836 disclosed?
CVE-2016-9836 was first published in the National Vulnerability Database on December 5, 2016, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-9836 actively exploited?
CVE-2016-9836 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 21.4% of all scored CVEs.
What is the CVSS score of CVE-2016-9836?
CVE-2016-9836 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-9836?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-9836, 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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