CVE-2026-1621Network attack vector

Unauthenticated registration bypass via trusted identifiers

Published Aug 14, 2026 · Updated Aug 14, 2026

Authentication bypass in Universal Yazılım E-Belediye allows remote attackers to bypass registration by exploiting trusted identifiers. TR-CERT has not disclosed the affected endpoint, identifier format, or validation operation that accepts an untrusted identifier. The pre-authentication path requires no user interaction, but the record does not identify which account state or municipal data becomes writable.

CVSS severity5.3
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Universal Yazılım E-Belediye allows remote attackers to bypass registration by exploiting trusted identifiers. TR-CERT has not disclosed the affected endpoint, identifier format, or validation operation that accepts an untrusted identifier. The pre-authentication path requires no user interaction, but the record does not identify which account state or municipal data becomes writable.

The record

CVE
CVE-2026-1621
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
Universal Yazılım A.Ş.
Product
E-Belediye
Classifications
CWE-305, CAPEC-21, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=20251127 <20260204

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Universal Yazılım A.Ş. · E-Belediyeversion=20251127 <20260204

Published CVSS scores

5.3TR-CERTCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-305Authentication Bypass by Primary Weakness
CAPEC-21Exploitation of Trusted Identifiers
T1136Create Account

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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