CVE-2026-11838Network attack vector

Authenticated data manipulation via missing function authentication

Published Sep 9, 2026 · Updated Sep 9, 2026

Missing authentication in Yordam Library Reservation System before 22.2 allows remote authenticated users to manipulate reservation data. The CNA identifies an authentication check omitted from a critical data-input function but does not disclose the endpoint, request fields, or code path. A low-privilege account and network access are required; the documented effect is limited to unauthorized data changes, with no confidentiality or availability impact.

CVSS severity4.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Yordam Library Reservation System before 22.2 allows remote authenticated users to manipulate reservation data. The CNA identifies an authentication check omitted from a critical data-input function but does not disclose the endpoint, request fields, or code path. A low-privilege account and network access are required; the documented effect is limited to unauthorized data changes, with no confidentiality or availability impact.

The record

CVE
CVE-2026-11838
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Yordam Information Technology Consulting Education and Electronic Systems Ind. Trade Inc.
Product
Library Reservation System
Classifications
CWE-306, CAPEC-153, T1565
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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 <v22.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Yordam Information Technology Consulting Education and Electronic Systems Ind. Trade Inc. · Library Reservation Systemversion=0 <v22.2

Published CVSS scores

4.3TR-CERTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CAPEC-153Input Data Manipulation
T1565Data Manipulation

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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