Medium
MS Teams plugin OAuth allows editing arbitrary posts
Type: advisorySources: OSV
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-55073
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:26 UTC · Revision 1
Source evidence
MS Teams plugin OAuth allows editing arbitrary posts
core-osv · Original sourcePublished 14 Nov 2025, 08:03 UTC
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.
osv:CVE-2025-55073
Complete source record
{
"id": "53d3eaf3d446c63fca782ee8beb66f2fda0032f7d65079760cbadd239511c220",
"url": "https://osv.dev/vulnerability/CVE-2025-55073",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "MS Teams plugin OAuth allows editing arbitrary posts",
"summary": "Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.",
"evidence": "osv:CVE-2025-55073",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-55073",
"aliases": [
"CVE-2025-55073",
"GHSA-ff85-qw3h-g9vp",
"GO-2025-4129"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mattermost/mattermost",
"type": "GIT",
"events": [
{
"introduced": "58bd34fd34cbd7d3da777d627b6cffdf8a532930"
},
{
"fixed": "9fa25cd55b43d735a39c6925d7e0021697ae049d"
},
{
"introduced": "5b955468ea1ea8b56c0fb10feb258a36a767d7bb"
},
{
"fixed": "83a5be3f9ed65d8457ab8cca853826d0c8425a8b"
},
{
"introduced": "ba3dc1612ce8f37bf9814b1ea6364181fb5abd62"
},
{
"fixed": "6819e6e43e17a7a449727be2b7431f4a28477510"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.5.0"
},
{
"fixed": "10.5.12"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.11.0"
},
{
"fixed": "10.11.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.12.0"
},
{
"fixed": "10.12.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v10.11.4-rc2",
"v10.5.12-rc1",
"v10.11.4-rc1",
"v10.12.1-rc1",
"v10.11.3",
"v10.5.11",
"v10.12.0",
"mattermost-redux@10.12.0",
"@mattermost/types@10.12.0",
"@mattermost/client@10.12.0",
"v10.11.2-rc2",
"v10.11.2",
"v10.5.11-rc1",
"v10.11.2-rc1",
"v10.5.10",
"v10.11.1",
"v10.5.10-rc2",
"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",
"v10.5.10-rc1",
"v10.5.9",
"v10.5.9-rc4",
"v10.5.9-rc3",
"v10.5.9-rc2",
"v10.5.9-rc1",
"v10.5.8",
"v10.5.8-rc1",
"v10.5.7",
"v10.5.6-rc1",
"v10.5.6",
"v10.5.5",
"v10.5.5-rc1",
"v10.5.4-rc2",
"v10.5.4",
"v10.5.4-rc1",
"v10.5.3",
"v10.5.3-rc1",
"v10.5.2",
"v10.5.1",
"v10.5.1-rc2",
"v10.5.1-rc1",
"v10.5.0-rc6",
"v10.5.0",
"@mattermost/types@10.5.0",
"@mattermost/client@10.5.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-55073.json"
}
}
],
"modified": "2026-10-28T02:30:30.808005506Z",
"provider": "osv",
"references": [
"https://mattermost.com/security-updates",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55073.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-55073"
],
"provider_metadata": {
"cwe_ids": [
"CWE-306"
],
"cna_assigner": "Mattermost",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "10.12.0"
},
{
"last_affected": "10.12.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
}
]
},
{
"extracted_events": [
{
"range": [
{
"introduced": "10.11.0"
},
{
"last_affected": "10.11.3"
},
{
"introduced": "10.5.0"
},
{
"last_affected": "10.5.11"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55073.json"
}
},
"related_cves": [
{
"value": "CVE-2025-55073",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 497833,
"published_at": "2025-11-14T08:03:16.922+00:00"
}