CVE-2026-50590

Local arbitrary file access via temporary-file handling

Published Jun 5, 2026 · Updated Jun 5, 2026

Incorrect permissions in Mimecast Incydr before 2.6.0 allow local users to access arbitrary files on monitored endpoints. The insider risk agent's temporary- and log-file creation and access logic fails to keep file operations within intended permission boundaries. Exploitation requires local reach and high-complexity conditions, and the reported consequence is limited file confidentiality and integrity impact without service interruption.

CVSS severity4.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect permissions in Mimecast Incydr before 2.6.0 allow local users to access arbitrary files on monitored endpoints. The insider risk agent's temporary- and log-file creation and access logic fails to keep file operations within intended permission boundaries. Exploitation requires local reach and high-complexity conditions, and the reported consequence is limited file confidentiality and integrity impact without service interruption.

The record

CVE
CVE-2026-50590
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
Mimecast
Product
Incydr
Classifications
CWE-732, T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.2.0 <2.6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Mimecast · Incydrversion=1.2.0 <2.6.0

Published CVSS scores

4.5MITRECVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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