https://db.gcve.eu/rss/recent/all/10 Most recent entries from all 2026-09-30T12:16:27.845634+00:00 Vulnerability-Lookup info@gcve.eu python-feedgen Contains only the most 10 recent entries. https://db.gcve.eu/vuln/cve-2026-4915 CVE-2026-4915 — Server panic via outgoing webhook responses 2026-09-30T12:16:27.861038+00:00

Affected: Mattermost

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to filter nil elements from outgoing webhook attachment payloads before processing, which allows an authenticated user to cause a denial of service (server process termination) via a crafted webhook callback response containing a null attachment entry.. Mattermost Advisory ID: MMSA-2026-00641