CVE-2026-88995Network attack vector

Unauthenticated appointment data disclosure via availability check

Published Sep 13, 2026 · Updated Sep 13, 2026

Information disclosure in Nexcess Bookit before 2.6.0.1 allows remote attackers to retrieve customers' appointment details. The day-appointments AJAX endpoint returns records for an availability request without limiting the response to fields needed to display open time slots. No account is required; exposed data includes contact information and free-text booking comments, while no modification or service interruption is reported.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
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 Nexcess Bookit before 2.6.0.1 allows remote attackers to retrieve customers' appointment details. The day-appointments AJAX endpoint returns records for an availability request without limiting the response to fields needed to display open time slots. No account is required; exposed data includes contact information and free-text booking comments, while no modification or service interruption is reported.

The record

CVE
CVE-2026-88995
Published
Sep 13, 2026
Updated
Sep 13, 2026
Vendor
Nexcess
Product
Bookit
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 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=0 <2.6.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nexcess · Bookitversion=0 <2.6.0.1

Published CVSS scores

No CVSS assessment is available in this record.

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

T1190Exploit Public-Facing Application

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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