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CVE-2026-85891ImportantInformation DisclosureNetwork

Azure HDInsight Information Disclosure Vulnerability

MSRC advisory NVD CVE.org

Assessment

Exposure of sensitive information to an unauthorized actor in Azure HDInsight allows an unauthorized attacker to disclose information over a network.

Severity
Important
CVSS base score
7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Impact
Information Disclosure
EPSS, next 30 days
0.9%Higher than 60.1% of scored CVEs · FIRST model run 25 Oct 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Required: apply the update
Component
Azure HDInsight
Weakness
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Issued by
Microsoft
Published
13 Oct 2026 · October 2026
Last revised
13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
NoneI:N
Availability
NoneA:N

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Azure
1 affected product

What changed

First observed 14 Oct 2026
  1. 25 Oct 2026 · 17:12:51 UTC EPSS0.9%; scored 24 Oct 2026 → 0.9%; scored 25 Oct 2026
  2. 25 Oct 2026 · 01:34:18 UTC EPSS0.9%; scored 23 Oct 2026 → 0.9%; scored 24 Oct 2026
  3. 23 Oct 2026 · 15:51:28 UTC EPSS0.9%; scored 22 Oct 2026 → 0.9%; scored 23 Oct 2026
  4. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  5. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  6. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  7. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  8. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  9. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  10. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  11. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  12. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
Show 12 more recent changes
  1. 23 Oct 2026 · 08:31:50 UTCSource coverage: first-epss Current → Incomplete
  2. 23 Oct 2026 · 08:31:50 UTCSource coverage: cisa-kev Current → Incomplete
  3. 23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
  4. 22 Oct 2026 · 17:33:15 UTCEPSS 0.9%; scored 21 Oct 2026 → 0.9%; scored 22 Oct 2026
  5. 21 Oct 2026 · 21:47:24 UTCEPSS 0.9%; scored 20 Oct 2026 → 0.9%; scored 21 Oct 2026
  6. 20 Oct 2026 · 20:53:31 UTCEPSS 0.9%; scored 19 Oct 2026 → 0.9%; scored 20 Oct 2026
  7. 19 Oct 2026 · 15:12:40 UTCEPSS 0.9%; scored 18 Oct 2026 → 0.9%; scored 19 Oct 2026
  8. 18 Oct 2026 · 14:54:30 UTCEPSS 0.9%; scored 16 Oct 2026 → 0.9%; scored 18 Oct 2026
  9. 18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves
  10. 16 Oct 2026 · 16:13:25 UTCEPSS 0.9%; scored 15 Oct 2026 → 0.9%; scored 16 Oct 2026
  11. 15 Oct 2026 · 21:30:54 UTCEPSS 0.9%; scored 14 Oct 2026 → 0.9%; scored 15 Oct 2026
  12. 15 Oct 2026 · 01:07:54 UTCEPSS Not scored → 0.9%; scored 14 Oct 2026

The most recent 100 field changes are listed. Complete recorded revisions are kept separately.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

Explore global source statements, affected packages and advisory history for CVE-2026-85891. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

Immutable source observations

5 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 25 Oct 21:06 UTC · 271 of 271 readable · 269 fully read · documentation 464/464 current

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