CVE-2021-22949Network attack vector

Unauthorized file duplication via missing CSRF token

Published Sep 23, 2021 · Updated Aug 3, 2024

Cross-Site Request Forgery in Concrete CMS 8.5.5 and earlier allows remote attackers to duplicate files via a crafted request. The File Manager duplication endpoint lacked CSRF-token validation, so a remote authenticated user’s browser could be induced to submit the state-changing request. Successful requests create duplicate files, causing UI inconvenience and potentially exhausting disk space.

CVSS severity5.4
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-Site Request Forgery in Concrete CMS 8.5.5 and earlier allows remote attackers to duplicate files via a crafted request. The File Manager duplication endpoint lacked CSRF-token validation, so a remote authenticated user’s browser could be induced to submit the state-changing request. Successful requests create duplicate files, causing UI inconvenience and potentially exhausting disk space.

The record

CVE
CVE-2021-22949
Published
Sep 23, 2021
Updated
Aug 3, 2024
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-352
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Fixed in version 8.5.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Concrete CMS · Concrete CMSversion=Fixed in version 8.5.6

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
5.8NVDAV:N/AC:M/Au:N/C:N/I:P/A:P

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

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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