CVE-2021-23266Network attack vector

Log-viewer deception via unescaped URL text

Published May 16, 2022 · Updated Sep 16, 2024

Log injection in CrafterCMS 3.1 through 3.1.17 allows remote attackers to place deceptive text in administrator-visible logs via crafted URLs. Crafter Studio records attacker-controlled URL text as-is, and its log viewer presents that text without neutralizing it as untrusted content. Exploitation requires no account, but an administrator must view the affected log; the established consequence is misleading log content.

CVSS severity4.3
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Log injection in CrafterCMS 3.1 through 3.1.17 allows remote attackers to place deceptive text in administrator-visible logs via crafted URLs. Crafter Studio records attacker-controlled URL text as-is, and its log viewer presents that text without neutralizing it as untrusted content. Exploitation requires no account, but an administrator must view the affected log; the established consequence is misleading log content.

The record

CVE
CVE-2021-23266
Published
May 16, 2022
Updated
Sep 16, 2024
Vendor
Crafter Software Corporation
Product
CrafterCMS
Classifications
CWE-116, CWE-117
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=3.1 <=3.1.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Crafter Software Corporation · CrafterCMSversion=3.1 <=3.1.17

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
4.3Crafter CMSCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-116Improper Encoding or Escaping of Output
CWE-117Improper Output Neutralization for Logs

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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