Issue Summary

The frontend script constructing the __ /rest/api/search?cql=... request in the Insert files and images > Search on other pages dialog omits double quotes around space.key. This breaks search for any space key starting with a digit or personal spaces (~username).

• The client-side JavaScript constructs the CQL filter dynamically by appending the selected space key unquoted: 

  AND space.key = 1Test
  

• It should instead quote the space key to ensure valid syntax regardless of the space key format: 

  AND space.key = "2DEF"

Steps to Reproduce

1. Create a space with a key starting with a digit/number (e.g. 1Test) or a personal space.
2. Create a page in that space and add an attachment to it
3. Create a new page and go to "Insert Files & Images" option
4. Choose "Search on other pages"
5. Enter the name of the file, which was uploaded in step 2
6. Choose to search the current space (from the drop down instead of “All Spaces”) and click on "Search"

Expected Results

Confluence correctly queries /rest/api/search?cql=... AND space.key = "1Test" and displays matching attachments.

Actual Results

• Confluence queries /rest/api/search?cql=... AND space.key = 1Test without double quotes.

• The backend CQL parser throws a 400 Bad Request, causing the search to display nothing

Here are the corresponding access log responses for both test cases (affected space search vs. all spaces search):

--Seach within the space 1Test:

172.50.0.2 admin [05/Oct/2026:18:22:14 +0000] "GET /confluence/rest/api/search?cql=(title%20~%20%22welcome.png*%22%20OR%20parent.title%20~%20%22welcome.png*%22)%20AND%20type%20%3D%20attachment%20AND%20space.key%20%3D%201TES&expand=content.version%2Ccontent.container%2Ccontent.space&limit=50&_=1791224072806 HTTP/1.1" 400 244 11138 /confluence/rest/api/search http-nio-8090-exec-9 "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/154.0.0.0 Safari/537.36"

--Search within all the space:

172.50.0.2 admin [05/Oct/2026:18:22:36 +0000] "GET /confluence/rest/api/search?cql=(title%20~%20%22welcome.png*%22%20OR%20parent.title%20~%20%22welcome.png*%22)%20AND%20type%20%3D%20attachment&expand=content.version%2Ccontent.container%2Ccontent.space&limit=50&_=1791224072808 HTTP/1.1" 200 4138 230573 /confluence/rest/api/search http-nio-8090-exec-29 "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/154.0.0.0 Safari/537.36"

HAR file: confluence.atlassian.internal.har

Workaround

Choose to search “All Spaces” from the drop down instead of the current space