CVE-2026-28736

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Source
https://cve.org/CVERecord?id=CVE-2026-28736
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28736.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-28736
Aliases
Downstream
Related
Published
2026-04-03T13:25:53Z
Modified
2026-08-12T03:51:47Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Focalboard IDOR in file content endpoint allows cross-user file access (unsupported product, no fix)
Details

** UNSUPPORTED WHEN ASSIGNED ** Focalboard version 8.0 fails to validate file ownership when serving uploaded files. This allows an authenticated attacker who knows a victim's fileID to read the content of the file. NOTE: Focalboard as a standalone product is not maintained and no fix will be issued.

Database specific 
{
    "cna_assigner": "Mattermost",
    "cwe_ids": [
        "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28736.json"
}
References

Affected packages

Git / github.com/mattermost-community/focalboard

Affected ranges

Type
GIT
Repo
https://github.com/mattermost-community/focalboard
Events
Introduced
568a5f01b6b9c15f84b8733b60d7a88c222939c2
Last Affected
568a5f01b6b9c15f84b8733b60d7a88c222939c2
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:mattermost:focalboard:8.0.0:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "8.0"
        },
        {
            "introduced": "8.0.0"
        },
        {
            "last_affected": "8.0.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_STRING"
    ]
}

Affected versions

8.*
8.0.0
v8.*
v8.0.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28736.json"