CVE-2026-21388 - Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}} Webhook Endpoint

CVE-2026-21388 - Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}} Webhook Endpoint

https://cvefeed.io/rssfeed/latest.atom / Thu, 04/09/2026 - 15:42
CVE ID :CVE-2026-21388
Published : April 9, 2026, 11:16 a.m. | 1 hour, 52 minutes ago
Description :Mattermost Plugins versions <=2.3.1 fail to limit the request body size on the {{/lifecycle}} webhook endpoint which allows an authenticated attacker to cause memory exhaustion and denial of service via sending an oversized JSON payload. Mattermost Advisory ID: MMSA-2026-00610
Severity: 3.7 | LOW
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Kenya Education Network CERT(KENET-CERT) is a Cybersecurity Emergency Response Team and Co-ordination Center operated by the National Research and Education Network of Kenya. KENET-CERT coordination center promotes awareness on cybersecurity incidences as well as coordinates and assists member institutions in responding effectively to cyber security threats and incidences. KENET-CERT works closely with Kenya's National CIRT coordination center (CIRT/CC) as a sector CIRT for the academic institutions. KENET promotes use of ICT in Teaching, Learning and Research in Higher Education Institutions in Kenya. KENET aims to interconnect all the Universities, Tertiary and Research Institutions in Kenya by setting up a cost effective and sustainable private network with high speed access to the global Internet. KENET also facilitates electronic communication among students and faculties in member institutions, share learning and teaching resources by collaboration in Research and Development of Educational content.