CVE-2026-44255

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (47th percentile of EPSS-scored CVEs). 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.0.0 until 4.14.6 and 5.0.0-beta2, AuthenticationManager.check_user() in framework/wazuh/rbac/orm.py performs check_password_hash() only when the supplied username exists. A nonexistent username returns immediately, while a valid username causes an expensive bcrypt calculation. An unauthenticated remote attacker can compare authentication response times to enumerate valid Wazuh usernames and use that information in subsequent credential attacks. This issue is fixed in versions 4.14.6 and 5.0.0-beta2.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

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
Severity53% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 19, 2026

Last Modified

September 18, 2026

Advisory Details (5)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

Wazuh v5.0.0 Beta 2

Patch available: wazuh/wazuh v5.0.0-beta2 (pre-release)

https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2
github_release Patch Available

Wazuh v4.14.6

Patch available: wazuh/wazuh v4.14.6

https://github.com/wazuh/wazuh/releases/tag/v4.14.6
github_commit Patch Available

commit 5ecea7b38b99 (wazuh/wazuh)

Patch available: wazuh/wazuh v5.0.0-beta2 (contains commit 5ecea7b38b99)

https://github.com/wazuh/wazuh/commit/5ecea7b38b998407cb0d205467dd247140a0f981
github_pr Patch Available

Add cluster validations

Patch available: wazuh/wazuh v5.0.0-beta2 (PR #35757 merged 2026-04-28)

https://github.com/wazuh/wazuh/pull/35757
githubMentions a patch (unverified)🟡 PoC Available

Username Enumeration via Timing Side-Channel · Advisory · wazuh/wazuh · GitHub

https://github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 42× 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. 2026-10-10 20:00 UTCEPSS rescore
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  3. 2026-10-08 17:12 UTCEPSS rescore
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  5. 2026-10-07 10:27 UTCEG score recompute
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  15. 2026-09-30 15:03 UTCEPSS rescore
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  18. 2026-09-27 13:48 UTCEPSS rescore
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  21. 2026-09-25 03:54 UTCEG score recompute
  22. 2026-09-24 01:49 UTCEG score recompute
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  24. 2026-09-22 23:45 UTCEG score recompute
  25. 2026-09-21 21:19 UTCEG score recompute
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  1. 2026-09-19 17:08 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 15:04 UTCEG score recompute
  4. 2026-09-17 19:31 UTCEPSS rescore
  5. 2026-09-17 13:11 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescore
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  18. 2026-09-10 09:34 UTCEPSS rescore
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  22. 2026-09-07 09:33 UTCEG score recompute
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-06 06:16 UTCEG score recompute
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  27. 2026-09-02 23:57 UTCEG score recompute
  28. 2026-09-02 14:12 UTCEPSS rescore
  29. 2026-09-01 21:53 UTCEG score recompute
  30. 2026-09-01 13:54 UTCEPSS rescore
  31. 2026-08-31 19:49 UTCEG score recompute
  32. 2026-08-30 19:17 UTCEPSS rescore
  33. 2026-08-30 13:58 UTCEG score recompute
  34. 2026-08-30 01:22 UTCEPSS rescore
  35. 2026-08-29 11:54 UTCEG score recompute
  36. 2026-08-28 21:41 UTCEPSS rescore
  37. 2026-08-28 09:47 UTCEG score recompute
  38. 2026-08-27 14:25 UTCEPSS rescore
  39. 2026-08-27 07:32 UTCEG score recompute
  40. 2026-08-26 14:46 UTCEPSS rescore
  41. 2026-08-26 05:26 UTCEG score recompute
  42. 2026-08-25 13:49 UTCEPSS rescore
  43. 2026-08-25 03:22 UTCEG score recompute
  44. 2026-08-25 02:45 UTCEG score recompute
  45. 2026-08-24 01:41 UTCEG score recompute
  46. 2026-08-23 00:19 UTCEPSS rescore
  47. 2026-08-22 23:37 UTCEG score recompute
  48. 2026-08-21 23:49 UTCEPSS rescore
  49. 2026-08-21 21:32 UTCEG score recompute
  50. 2026-08-20 22:55 UTCEPSS rescore
  51. 2026-08-19 17:23 UTCEG score recompute
  52. 2026-08-19 16:22 UTCEG score recompute
  53. 2026-08-19 16:22 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-44255?
CVE-2026-44255 is a medium vulnerability published on August 19, 2026. Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.0.0 until 4.14.6 and 5.0.0-beta2, AuthenticationManager.checkuser() in framework/wazuh/rbac/orm.py performs checkpassword_hash() only when the supplied username exists. A nonexistent username…
When was CVE-2026-44255 disclosed?
CVE-2026-44255 was first published on August 19, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44255 actively exploited?
CVE-2026-44255 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-44255?
CVE-2026-44255 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-44255?
A fix for CVE-2026-44255 is available: update to the fixed version the vendor names in its advisory.

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