CVE-2026-21827Network attack vector

Unauthorized sensitive-data disclosure via improper request handling

Published Aug 31, 2026 · Updated Sep 1, 2026

Information disclosure in HCL Software's Connections 7.0 and 8.0 allows remote attackers to obtain sensitive data belonging to other users. HCL attributes the exposure to improper handling of request data but has not disclosed the affected endpoint or operation. Exploitation requires network access and user interaction; the published assessment identifies limited confidentiality loss without data modification or service interruption.

CVSS severity3.1
Low
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in HCL Software's Connections 7.0 and 8.0 allows remote attackers to obtain sensitive data belonging to other users. HCL attributes the exposure to improper handling of request data but has not disclosed the affected endpoint or operation. Exploitation requires network access and user interaction; the published assessment identifies limited confidentiality loss without data modification or service interruption.

The record

CVE
CVE-2026-21827
Published
Aug 31, 2026
Updated
Sep 1, 2026
Vendor
HCL Software
Product
HCL Connections
Classifications
CWE-359
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 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=7.0, 8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HCL Software · HCL Connectionsversion=7.0, 8.0

Published CVSS scores

3.1HCL SoftwareCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-359Exposure of Private Personal Information to an Unauthorized Actor

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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