CERTFR-2026-AVI-1128
Vulnerability from certfr_avis - Published: 2026-09-08 - Updated: 2026-09-15
De multiples vulnérabilités ont été découvertes dans Mattermost Server. Elles permettent à un attaquant de provoquer un déni de service à distance.
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 11.8.x antérieures à 11.8.5 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 10.11.x antérieures à 10.11.23 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.9 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.9.x antérieures à 11.9.1 |
References
| Title | Publication Time | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.8.x ant\u00e9rieures \u00e0 11.8.5",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 10.11.x ant\u00e9rieures \u00e0 10.11.23",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.9",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.9.x ant\u00e9rieures \u00e0 11.9.1",
"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-2026-86349",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-86349"
},
{
"name": "CVE-2026-86348",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-86348"
}
],
"initial_release_date": "2026-09-08T00:00:00",
"last_revision_date": "2026-09-15T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1128",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-09-08T00:00:00.000000"
},
{
"description": "Ajout des identifiants CVE, modification des risques en cons\u00e9quence.",
"revision_date": "2026-09-15T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Mattermost Server. Elles permettent \u00e0 un attaquant de provoquer un d\u00e9ni de service \u00e0 distance.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Mattermost Server",
"vendor_advisories": [
{
"published_at": "2026-09-07",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00701",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-09-07",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00707",
"url": "https://mattermost.com/security-updates/"
}
]
}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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