Medium
Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls
Type: advisorySources: OSV
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-0998
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 01:19 UTC · Revision 1
Source evidence
Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls
core-osv · Original sourcePublished 16 Feb 2026, 09:54 UTC
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534
osv:CVE-2026-0998
Complete source record
{
"id": "ac106d1b78589bcc8ac2bda88db6dd21b6128e176b68fb50f93a7492d103c4b7",
"url": "https://osv.dev/vulnerability/CVE-2026-0998",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls",
"summary": "Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534",
"evidence": "osv:CVE-2026-0998",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-0998",
"aliases": [
"CVE-2026-0998",
"GHSA-w65c-fvp5-fvc5",
"GO-2026-4525"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mattermost/mattermost",
"type": "GIT",
"events": [
{
"introduced": "5b955468ea1ea8b56c0fb10feb258a36a767d7bb"
},
{
"fixed": "ba27ba1f8cb1ffe2b1a79dc3d15a3ffa7de12fd7"
},
{
"introduced": "e62f350cd7a896c45a0e025f44cb8915f5597854"
},
{
"fixed": "7d0e4261dd4bc45162be3183ac19241f43a3f994"
},
{
"introduced": "ab7b138824c61fe1fe815243d7e2a914dec49c8b"
},
{
"fixed": "cfbe9d9254d4903777fab5957924d260cb5b74ff"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.11.0"
},
{
"fixed": "10.11.10"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.1.0"
},
{
"fixed": "11.1.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.2.0"
},
{
"fixed": "11.2.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v11.1.2-rc1",
"v11.1.2",
"v10.11.9",
"v11.2.1",
"v11.2.1-rc1",
"v11.2.0",
"v10.11.9-rc1",
"v10.11.8",
"v11.1.1",
"v11.1.1-rc2",
"v11.1.1-rc1",
"v10.11.7",
"v11.1.0-rc4",
"v11.1.0",
"mattermost-redux@11.1.0",
"@mattermost/types@11.1.0",
"@mattermost/client@11.1.0",
"v10.11.6",
"v10.11.5",
"v10.11.4-rc3",
"v10.11.4",
"v10.11.4-rc2",
"v10.11.4-rc1",
"v10.11.3",
"v10.11.2-rc2",
"v10.11.2",
"v10.11.2-rc1",
"v10.11.1",
"v10.11.1-rc1",
"v10.11.0-rc3",
"v10.11.0",
"mattermost-redux@10.11.0",
"@mattermost/types@10.11.0",
"@mattermost/client@10.11.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-0998.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/mattermost/mattermost-plugin-zoom",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "de12f01f07f4e03e912c2ec6e14d25c9f81d27da"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mattermost:zoom:*:*:*:*:*:mattermost:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "1.11.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v1.11.0-rc1",
"v1.11.0",
"v1.10.0-rc2",
"v1.10.0",
"v1.10.0-rc1",
"v1.9.0-rc2",
"v1.9.0",
"v1.9.0-rc1",
"v1.8.0-rc1",
"v1.8.0",
"v1.7.1-rc1",
"v1.7.0",
"v1.7.0-rc2",
"v1.5.1",
"v1.5.0",
"v1.4.1",
"v1.4.0",
"v1.3.1",
"v1.3.0",
"v1.2.0",
"v1.1.2",
"v1.1.1",
"v1.1.0",
"v1.0.6",
"v1.0.5",
"v1.0.4",
"v1.0.3",
"v1.0.2",
"v1.0.1",
"v1.0.0",
"v0.1.6",
"v0.1.5",
"v0.1.4",
"v0.1.3",
"v0.1.2",
"v0.1.1",
"v0.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-0998.json"
}
}
],
"modified": "2026-10-28T02:30:24.745364518Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0998.json",
"https://mattermost.com/security-updates",
"https://nvd.nist.gov/vuln/detail/CVE-2026-0998"
],
"provider_metadata": {
"cwe_ids": [
"CWE-862"
],
"cna_assigner": "Mattermost",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "11.1.0"
},
{
"last_affected": "11.1.2"
},
{
"introduced": "10.11.0"
},
{
"last_affected": "10.11.9"
},
{
"introduced": "11.2.0"
},
{
"last_affected": "11.2.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0998.json"
}
},
"related_cves": [
{
"value": "CVE-2026-0998",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 491544,
"published_at": "2026-02-16T09:54:24.732+00:00"
}