CVE-2026-66491

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% 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: cna:joomla, epss
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

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

Joomla Extension - phoca.cz - Arbitrary File Read in Phoca Commander 1.0.0-6.1.3 - Improper limitation of paths in the getSource function lead to an arbitrary file read vulnerability.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

August 7, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated Aug 7, 2026
No patch confirmed yet.
generic

Phoca Commander

https://www.phoca.cz/phocacommander

Vendor Advisories for CVE-2026-66491(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 54× 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.

  1. 2026-08-20 07:55 UTCGHSA enrichment
  2. 2026-08-19 18:47 UTCEG score recompute
  3. 2026-08-19 18:47 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 04:48 UTCGHSA enrichment
  6. 2026-08-18 15:40 UTCEG score recompute
  7. 2026-08-18 15:40 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 02:01 UTCEG score recompute
  10. 2026-08-18 02:00 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-17 12:51 UTCGHSA enrichment
  13. 2026-08-16 23:43 UTCEG score recompute
  14. 2026-08-16 23:43 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 10:35 UTCEG score recompute
  17. 2026-08-16 10:35 UTCGHSA enrichment
  18. 2026-08-15 21:25 UTCGHSA enrichment
  19. 2026-08-15 08:17 UTCEG score recompute
  20. 2026-08-15 08:17 UTCGHSA enrichment
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 19:08 UTCGHSA enrichment
  23. 2026-08-14 06:00 UTCEG score recompute
  24. 2026-08-14 06:00 UTCGHSA enrichment
  25. 2026-08-13 22:00 UTCEPSS rescore
Show 29 more
  1. 2026-08-13 16:51 UTCGHSA enrichment
  2. 2026-08-13 03:43 UTCGHSA enrichment
  3. 2026-08-12 14:35 UTCEG score recompute
  4. 2026-08-12 14:35 UTCGHSA enrichment
  5. 2026-08-12 13:51 UTCEPSS rescore
  6. 2026-08-12 01:26 UTCEG score recompute
  7. 2026-08-12 01:26 UTCGHSA enrichment
  8. 2026-08-11 12:18 UTCEG score recompute
  9. 2026-08-11 12:18 UTCGHSA enrichment
  10. 2026-08-11 00:00 UTCEPSS rescore
  11. 2026-08-10 23:10 UTCGHSA enrichment
  12. 2026-08-10 10:01 UTCEG score recompute
  13. 2026-08-10 10:01 UTCGHSA enrichment
  14. 2026-08-09 20:55 UTCEG score recompute
  15. 2026-08-09 20:55 UTCGHSA enrichment
  16. 2026-08-09 13:47 UTCEPSS rescore
  17. 2026-08-09 07:47 UTCGHSA enrichment
  18. 2026-08-08 18:39 UTCEG score recompute
  19. 2026-08-08 18:39 UTCGHSA enrichment
  20. 2026-08-08 16:37 UTCEPSS rescore
  21. 2026-08-08 05:31 UTCEG score recompute
  22. 2026-08-08 05:31 UTCGHSA enrichment
  23. 2026-08-07 16:23 UTCEG score recompute
  24. 2026-08-07 16:23 UTCGHSA enrichment
  25. 2026-08-07 15:23 UTCEG score recompute
  26. 2026-08-07 15:23 UTCGHSA enrichment
  27. 2026-08-07 09:22 UTCEG score recompute
  28. 2026-08-07 08:33 UTCEG score recompute
  29. 2026-08-07 08:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66491?
CVE-2026-66491 is a high vulnerability published on August 7, 2026. Joomla Extension - phoca.cz - Arbitrary File Read in Phoca Commander 1.0.0-6.1.3 - Improper limitation of paths in the getSource function lead to an arbitrary file read vulnerability.
When was CVE-2026-66491 disclosed?
CVE-2026-66491 was first published in the National Vulnerability Database on August 7, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66491 actively exploited?
CVE-2026-66491 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 75.9% of all scored CVEs.
What is the CVSS score of CVE-2026-66491?
CVE-2026-66491 has a CVSS v4.0 base score of 8.2 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-66491?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66491, 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.

Dependency Blast Radius

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