{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/73435?format=json","vulnerability_id":"VCID-wuzq-r2tc-87ar","summary":"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","aliases":[{"alias":"CVE-2026-4915"}],"fixed_packages":[],"affected_packages":[],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-4915","reference_id":"","reference_type":"","scores":[{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14825","published_at":"2026-06-11T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14947","published_at":"2026-06-12T12:55:00Z"},{"value":"0.00047","scoring_system":"epss","scoring_elements":"0.14946","published_at":"2026-06-13T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-4915"},{"reference_url":"https://mattermost.com/security-updates","reference_id":"security-updates","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-26T14:37:36Z/"}],"url":"https://mattermost.com/security-updates"}],"weaknesses":[{"cwe_id":754,"name":"Improper Check for Unusual or Exceptional Conditions","description":"The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product."}],"exploits":[],"severity_range_score":"6.5 - 6.5","exploitability":null,"weighted_severity":null,"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-wuzq-r2tc-87ar"}