CVE-2015-8566

NONECVSS 0.0Elevated
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 8%CVSS: —Exploit: NoneExposed: 0

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

The Session package 1.x before 1.3.1 for Joomla! Framework allows remote attackers to execute arbitrary code via unspecified session values.

CVSS v3
—
EG Score
0.0(none)
EG Risk
0
EG Risk 0/100

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. It is distinct from the 0–10 EG Score, which measures severity.

EPSS
94.4%
KEV
Not listed

Published

December 16, 2015

Last Modified

May 6, 2026

References (4)

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
joomla/session1.0 ... 1.3.0 (11 versions)1.3.1—

Data Freshness Timeline

(refreshed 13× in last 7d / 41× 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. 2026-07-23 14:14 UTCEPSS rescore
  2. 2026-07-23 01:20 UTCEG score recompute
  3. 2026-07-23 00:21 UTCEG score recompute
  4. 2026-07-22 22:00 UTCEG score recompute
  5. 2026-07-22 14:04 UTCEPSS rescore
  6. 2026-07-21 15:21 UTCEPSS rescore
  7. 2026-07-21 15:21 UTCEPSS rescore
  8. 2026-07-20 17:03 UTCEPSS rescore
  9. 2026-07-19 14:27 UTCEPSS rescore
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  11. 2026-07-19 02:26 UTCEPSS rescore
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  14. 2026-07-16 16:59 UTCEPSS rescore
  15. 2026-07-15 16:54 UTCEPSS rescore
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  17. 2026-07-15 01:56 UTCEPSS rescore
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  20. 2026-07-12 05:42 UTCEPSS rescore
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  24. 2026-07-08 15:10 UTCEPSS rescore
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  1. 2026-07-07 13:42 UTCEPSS rescore
  2. 2026-07-06 02:20 UTCEPSS rescore
  3. 2026-07-05 02:26 UTCEPSS rescore
  4. 2026-07-04 06:28 UTCEPSS rescore
  5. 2026-07-01 15:02 UTCEPSS rescore
  6. 2026-06-30 23:19 UTCEPSS rescore
  7. 2026-06-30 23:19 UTCEPSS rescore
  8. 2026-06-29 14:03 UTCEPSS rescore
  9. 2026-06-29 14:03 UTCEPSS rescore
  10. 2026-06-28 14:04 UTCEPSS rescore
  11. 2026-06-28 04:53 UTCEPSS rescore
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  15. 2026-06-24 14:02 UTCEPSS rescore
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  17. 2026-06-23 21:30 UTCEPSS rescore
  18. 2026-06-22 14:23 UTCEPSS rescore
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  20. 2026-06-21 14:54 UTCEPSS rescore
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  22. 2026-06-21 01:57 UTCEPSS rescore
  23. 2026-06-21 01:57 UTCEPSS rescore
  24. 2026-06-19 19:23 UTCEPSS rescore
  25. 2026-06-19 19:23 UTCEPSS rescore
  26. 2026-06-18 17:50 UTCEPSS rescore
  27. 2026-06-17 17:50 UTCEPSS rescore
  28. 2026-06-17 17:49 UTCEPSS rescore
  29. 2026-06-16 17:50 UTCEPSS rescore
  30. 2026-06-16 17:50 UTCEPSS rescore
  31. 2026-06-15 17:45 UTCEPSS rescore
  32. 2026-06-14 23:14 UTCEPSS rescore
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  34. 2026-06-12 23:09 UTCEPSS rescore
  35. 2026-06-12 23:09 UTCEPSS rescore
  36. 2026-06-11 13:57 UTCEPSS rescore
  37. 2026-06-11 13:57 UTCEPSS rescore
  38. 2026-06-10 22:15 UTCEPSS rescore
  39. 2026-06-10 13:18 UTCEPSS rescore
  40. 2026-06-08 14:14 UTCEPSS rescore
  41. 2026-06-07 15:22 UTCEPSS rescore
  42. 2026-06-06 13:45 UTCEPSS rescore
  43. 2026-06-05 22:44 UTCEPSS rescore
  44. 2026-06-05 06:08 UTCEPSS rescore
  45. 2026-06-05 06:08 UTCEPSS rescore
  46. 2026-06-04 13:10 UTCEPSS rescore
  47. 2026-06-04 13:10 UTCEPSS rescore
  48. 2026-06-02 20:10 UTCEPSS rescore
  49. 2026-06-01 13:49 UTCEPSS rescore
  50. 2026-06-01 13:49 UTCEPSS rescore
  51. 2026-05-31 22:28 UTCEPSS rescore
  52. 2026-05-31 22:28 UTCEPSS rescore
  53. 2026-05-31 00:14 UTCEPSS rescore
  54. 2026-05-29 13:41 UTCEPSS rescore
  55. 2026-05-28 13:42 UTCEPSS rescore
  56. 2026-05-28 13:42 UTCEPSS rescore
  57. 2026-05-27 13:38 UTCEPSS rescore
  58. 2026-05-27 13:38 UTCEPSS rescore
  59. 2026-05-26 13:41 UTCEPSS rescore
  60. 2026-05-26 07:16 UTCEPSS rescore
  61. 2026-05-26 07:16 UTCEPSS rescore
  62. 2026-05-24 16:43 UTCEPSS rescore
  63. 2026-05-22 22:11 UTCEG score recompute
  64. 2026-05-22 21:15 UTCEPSS rescore
  65. 2026-05-21 22:40 UTCEPSS rescore
  66. 2026-05-20 22:37 UTCEPSS rescore
  67. 2026-05-20 22:37 UTCEPSS rescore
  68. 2026-05-20 11:21 UTCEPSS rescore
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  70. 2026-05-20 11:21 UTCEPSS rescore
  71. 2026-05-18 21:30 UTCEPSS rescore
  72. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-39033
    First seen Dec 18, 2015

    Joomla! 1.5 < 3.4.6 - Object Injection 'x-forwarded-for' Header Remote Code Execution

    Open source ↗

Frequently asked(4)

What is CVE-2015-8566?
CVE-2015-8566 is a none vulnerability published on December 16, 2015. The Session package 1.x before 1.3.1 for Joomla! Framework allows remote attackers to execute arbitrary code via unspecified session values.
When was CVE-2015-8566 disclosed?
CVE-2015-8566 was first published in the National Vulnerability Database on December 16, 2015, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-8566 actively exploited?
CVE-2015-8566 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2015-8566?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-8566, 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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