CVE-2021-47712Network attack vector

URL hash replay enables request manipulation

Published Dec 18, 2025 · Updated Dec 18, 2025

Cryptographic weakness in Kentico Xperience 12.0.102 and earlier allows remote attackers to manipulate hashed URL values. The URL-hashing mechanism permits reuse of existing valid hash values; Kentico has not identified the affected function or disclosed how reuse changes request processing. No authentication or user interaction is required, but published sources do not identify which data or actions a reused hash exposes.

CVSS severity6.9
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cryptographic weakness in Kentico Xperience 12.0.102 and earlier allows remote attackers to manipulate hashed URL values. The URL-hashing mechanism permits reuse of existing valid hash values; Kentico has not identified the affected function or disclosed how reuse changes request processing. No authentication or user interaction is required, but published sources do not identify which data or actions a reused hash exposes.

The record

CVE
CVE-2021-47712
Published
Dec 18, 2025
Updated
Dec 18, 2025
Vendor
Kentico
Product
Kentico Xperience
Classifications
CWE-327
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 2025Record 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 <=12.0.102

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kentico · Kentico Xperienceversion=0 <=12.0.102

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA: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-327Use of a Broken or Risky Cryptographic Algorithm

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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