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CERTFR-2026-AVI-0752
Vulnerability from certfr_avis - Published: 2026-06-15 - Updated: 2026-08-14
De multiples vulnérabilités ont été découvertes dans les produits Mattermost. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 10.11.x antérieures à 10.11.20 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.6.x antérieures à 11.6.5 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.3 |
References
| Title | Publication Time | Tags | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 10.11.x ant\u00e9rieures \u00e0 10.11.20",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.6.x ant\u00e9rieures \u00e0 11.6.5",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.3",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-10106",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-10106"
},
{
"name": "CVE-2026-9708",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9708"
},
{
"name": "CVE-2026-6850",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-6850"
},
{
"name": "CVE-2026-10085",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-10085"
},
{
"name": "CVE-2026-10103",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-10103"
},
{
"name": "CVE-2026-9820",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9820"
},
{
"name": "CVE-2026-9824",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9824"
},
{
"name": "CVE-2026-6541",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-6541"
},
{
"name": "CVE-2026-9571",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9571"
}
],
"initial_release_date": "2026-06-15T00:00:00",
"last_revision_date": "2026-08-14T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0752",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-06-15T00:00:00.000000"
},
{
"description": "Ajout d\u0027identifiants CVE et modification des risques en cons\u00e9quence.",
"revision_date": "2026-08-14T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Atteinte \u00e0 l\u0027int\u00e9grit\u00e9 des donn\u00e9es"
},
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans les produits Mattermost. Elles permettent \u00e0 un attaquant de provoquer un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans les produits Mattermost",
"vendor_advisories": [
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00683",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00680",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00671",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00658",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00653",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00688",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00690",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00676",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00689",
"url": "https://mattermost.com/security-updates/"
}
]
}
CVE-2026-10085 (GCVE-0-2026-10085)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:05 – Updated: 2026-07-13 13:57
VLAI
EPSS
VEX
Title
Ordinary group/direct message member can enable group_constrained and remove all channel participants
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict the group_constrained channel flag to public and private channels that support group synchronization, which allows an ordinary group or direct message member to remove all participants from the conversation via the channel patch API.. Mattermost Advisory ID: MMSA-2026-00688
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:56 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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}
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{
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}
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"dateReserved": "2026-05-29T11:54:45.722Z",
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"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-10103 (GCVE-0-2026-10103)
Vulnerability from cvelistv5 – Published: 2026-07-13 07:57 – Updated: 2026-07-14 14:32
VLAI
EPSS
VEX
Title
Authenticated remote cluster can modify or delete posts it does not own in Mattermost Connected Workspaces shared channels
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify post ownership in the shared channel inbound sync handler, which allows an authenticated remote cluster to modify or delete posts authored by local users or other remotes via crafted sync messages referencing arbitrary post IDs in channels shared with that remote.. Mattermost Advisory ID: MMSA-2026-00689
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 14:18 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
{
"containers": {
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],
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"timestamp": "2026-07-14T14:18:49.512657Z",
"version": "2.0.3"
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}
],
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},
"title": "CISA ADP Vulnrichment"
}
],
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"vendor": "Mattermost",
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},
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"status": "affected",
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}
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"type": "finder",
"value": "ratrarity"
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}
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"defect": [
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CVE-2026-10106 (GCVE-0-2026-10106)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:09 – Updated: 2026-07-13 13:56
VLAI
EPSS
VEX
Title
Unauthorized users can trigger interactive post actions in private channels via action cookie channel mismatch in Mattermost
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:56 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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"timestamp": "2026-07-13T13:56:34.893294Z",
"version": "2.0.3"
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"product": "Mattermost",
"vendor": "Mattermost",
"versions": [
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"status": "affected",
"version": "11.7.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "11.6.4",
"status": "affected",
"version": "11.6.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "10.11.19",
"status": "affected",
"version": "10.11.0",
"versionType": "semver"
},
{
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"version": "11.8.0"
},
{
"status": "unaffected",
"version": "11.7.3"
},
{
"status": "unaffected",
"version": "11.6.5"
},
{
"status": "unaffected",
"version": "10.11.20"
}
]
}
],
"credits": [
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"value": "minghseinyuc86595"
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}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
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CVE-2026-6541 (GCVE-0-2026-6541)
Vulnerability from cvelistv5 – Published: 2026-07-13 10:53 – Updated: 2026-07-13 13:09
VLAI
EPSS
VEX
Title
Unscoped updates to other playbooks' metric configuration
Summary
Mattermost versions 11.7.x <= 11.7.1, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict metric configuration changes to the playbook being saved, which allows an authenticated user with team access to alter another user’s playbook metric settings via a crafted import or update request with a foreign metric ID. Mattermost Advisory ID: MMSA-2026-00653
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:09 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.1
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.2 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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CVE-2026-6850 (GCVE-0-2026-6850)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:13 – Updated: 2026-07-13 13:56
VLAI
EPSS
VEX
Title
Crafted message attachment causes client-side denial of service via markdown parser regex backtracking in Mattermost
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload that triggers catastrophic backtracking in the client-side markdown parser.. Mattermost Advisory ID: MMSA-2026-00658
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:56 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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CVE-2026-9571 (GCVE-0-2026-9571)
Vulnerability from cvelistv5 – Published: 2026-07-13 07:50 – Updated: 2026-07-15 04:00
VLAI
EPSS
VEX
Title
Deactivated user accounts can continue to obtain valid OAuth access tokens via refresh token grant in Mattermost
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 00:00 UTC
CWE
- CWE-305 - – Authentication Bypass by Primary Weakness
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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CVE-2026-9708 (GCVE-0-2026-9708)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:00 – Updated: 2026-07-13 14:45
VLAI
EPSS
VEX
Title
Incoming webhook user attribution via unvalidated webhook owner
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate that an assigned incoming webhook user has access to the target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via crafted incoming webhook configuration and payloads.. Mattermost Advisory ID: MMSA-2026-00683
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 14:44 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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CVE-2026-9820 (GCVE-0-2026-9820)
Vulnerability from cvelistv5 – Published: 2026-07-13 10:51 – Updated: 2026-07-13 13:09
VLAI
EPSS
VEX
Title
Mattermost schemes teams endpoint exposes private team invite IDs
Summary
Mattermost versions 11.7.x <= 11.7.2, 10.11.x <= 10.11.19 fail to sanitize team objects returned by the scheme teams endpoint, which allows a user with the User Manager role to obtain invite links for private teams and use them to join or share access to those teams via the scheme teams API endpoint.. Mattermost Advisory ID: MMSA-2026-00671
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:09 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 10.11.20 |
Credits
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CVE-2026-9824 (GCVE-0-2026-9824)
Vulnerability from cvelistv5 – Published: 2026-07-13 10:47 – Updated: 2026-07-13 13:10
VLAI
EPSS
VEX
Title
Remote cluster metadata enumeration via /share-channel autocomplete
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel autocomplete handler, which allows an authenticated user without that permission to enumerate configured remote cluster connection metadata via slash command autocomplete.. Mattermost Advisory ID: MMSA-2026-00676
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:10 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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