CVE-2016-8581

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2022-05-17. NVD baseline CVSS 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 17%CVSS: 6.1Exploit: NoneExposed: 0

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

A persistent XSS vulnerability exists in the User-Agent header of the login process of AlienVault OSSIM and USM before 5.3.2 that allows an attacker to steal session IDs of logged in users when the current sessions are viewed by an administrator.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
58(Track)
EG Risk 58/100SSVC: 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
Severity61% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
96.7%
KEV
Not listed

Published

October 28, 2016

Last Modified

May 6, 2026

References (6)

Data Freshness Timeline

(refreshed 12× in last 7d / 40× 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. 2026-07-24 14:13 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
  3. 2026-07-23 01:24 UTCEG score recompute
  4. 2026-07-22 22:03 UTCEG score recompute
  5. 2026-07-22 14:04 UTCEPSS rescore
  6. 2026-07-21 15:21 UTCEPSS rescore
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  8. 2026-07-20 17:04 UTCEPSS rescore
  9. 2026-07-19 14:28 UTCEPSS rescore
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  15. 2026-07-16 16:59 UTCEPSS rescore
  16. 2026-07-16 16:59 UTCEPSS rescore
  17. 2026-07-15 16:54 UTCEPSS rescore
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  19. 2026-07-15 01:56 UTCEPSS rescore
  20. 2026-07-13 22:26 UTCEPSS rescore
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  24. 2026-07-11 08:24 UTCEPSS rescore
  25. 2026-07-09 19:06 UTCEPSS rescore
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  1. 2026-07-08 15:10 UTCEPSS rescore
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  4. 2026-07-06 02:20 UTCEPSS rescore
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  6. 2026-07-05 02:27 UTCEPSS rescore
  7. 2026-07-04 06:28 UTCEPSS rescore
  8. 2026-07-01 15:02 UTCEPSS rescore
  9. 2026-06-30 23:19 UTCEPSS rescore
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  11. 2026-06-29 14:03 UTCEPSS rescore
  12. 2026-06-28 14:04 UTCEPSS rescore
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  14. 2026-06-27 03:05 UTCEPSS rescore
  15. 2026-06-25 13:47 UTCEPSS rescore
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  17. 2026-06-23 21:30 UTCEPSS rescore
  18. 2026-06-21 14:54 UTCEPSS rescore
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  20. 2026-06-21 01:57 UTCEPSS rescore
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  22. 2026-06-18 17:50 UTCEPSS rescore
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  24. 2026-06-17 17:50 UTCEPSS rescore
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  26. 2026-06-16 17:50 UTCEPSS rescore
  27. 2026-06-15 17:45 UTCEPSS rescore
  28. 2026-06-14 23:14 UTCEPSS rescore
  29. 2026-06-14 23:14 UTCEPSS rescore
  30. 2026-06-12 23:09 UTCEPSS rescore
  31. 2026-06-11 13:57 UTCEPSS rescore
  32. 2026-06-08 14:14 UTCEPSS rescore
  33. 2026-06-05 22:44 UTCEPSS rescore
  34. 2026-06-05 06:08 UTCEPSS rescore
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  36. 2026-06-04 13:10 UTCEPSS rescore
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  38. 2026-06-02 20:10 UTCEPSS rescore
  39. 2026-06-01 13:49 UTCEPSS rescore
  40. 2026-06-01 13:49 UTCEPSS rescore
  41. 2026-05-31 00:14 UTCEPSS rescore
  42. 2026-05-29 13:41 UTCEPSS rescore
  43. 2026-05-28 13:42 UTCEPSS rescore
  44. 2026-05-28 13:42 UTCEPSS rescore
  45. 2026-05-27 13:38 UTCEPSS rescore
  46. 2026-05-27 13:38 UTCEPSS rescore
  47. 2026-05-26 13:42 UTCEPSS rescore
  48. 2026-05-26 13:42 UTCEPSS rescore
  49. 2026-05-24 16:44 UTCEPSS rescore
  50. 2026-05-22 21:15 UTCEPSS rescore
  51. 2026-05-22 18:06 UTCEG score recompute
  52. 2026-05-22 18:06 UTCGHSA enrichment
  53. 2026-05-20 22:37 UTCEPSS rescore
  54. 2026-05-20 22:37 UTCEPSS rescore
  55. 2026-05-20 22:37 UTCEPSS rescore
  56. 2026-05-18 21:30 UTCEPSS rescore
  57. 2026-05-18 21:30 UTCEPSS rescore
  58. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(2 references)

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

  • Exploit-DBEDB-40683✓ verified
    First seen Nov 2, 2016

    Alienvault OSSIM/USM 5.3.1 - Persistent Cross-Site Scripting

    Open source ↗
  • Metasploitexploit/linux/http/alienvault_sqli_exec✓ verified
    First seen Apr 24, 2014

    AlienVault OSSIM SQL Injection and Remote Code Execution

    Open source ↗

Frequently asked(5)

What is CVE-2016-8581?
CVE-2016-8581 is a medium vulnerability published on October 28, 2016. A persistent XSS vulnerability exists in the User-Agent header of the login process of AlienVault OSSIM and USM before 5.3.2 that allows an attacker to steal session IDs of logged in users when the current sessions are viewed by an administrator.
When was CVE-2016-8581 disclosed?
CVE-2016-8581 was first published in the National Vulnerability Database on October 28, 2016, 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-2016-8581 actively exploited?
CVE-2016-8581 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-8581?
CVE-2016-8581 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2016-8581?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-8581, 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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