Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to limit the size of the request body on the start meeting API endpoint, which allows an authenticated attacker to cause resource exhaustion or denial of service via a crafted oversized HTTP POST request to {{/api/v1/meetings}}.. Mattermost Advisory ID: MMSA-2026-00608
{
"cwe_ids": [
"CWE-770"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2325.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"introduced": "11.5.0"
},
{
"last_affected": "11.5.1"
},
{
"introduced": "10.11.0"
},
{
"last_affected": "10.11.13"
},
{
"introduced": "11.4.0"
},
{
"last_affected": "11.4.3"
}
],
"source": "AFFECTED_FIELD"
}
],
"cna_assigner": "Mattermost"
}{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"extracted_events": [
{
"introduced": "10.11.0"
},
{
"fixed": "10.11.14"
},
{
"introduced": "11.4.0"
},
{
"fixed": "11.4.4"
},
{
"introduced": "11.5.0"
},
{
"fixed": "11.5.2"
}
],
"source": "CPE_RANGE"
}