{"id":"CVE-2023-2793","aliases":["EUVD-2023-34249","GHSA-7qj9-mfh7-vg26"],"status":"published","title":"Stack exhaustion in PreparePostForClientWithEmbedsAndImages","description":"Mattermost fails to validate links on external websites when constructing a preview for a linked website, allowing an attacker to cause a denial-of-service by a linking to a specially crafted webpage in a message.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00562,"percentile":0.4706,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2023-06-16T09:02:34Z","modified":"2026-10-28T02:30:29Z","products":[{"vendor":"mattermost","product":"mattermost"}],"references":[{"url":"https://mattermost.com/security-updates/","tags":["x_transferred","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-2793","tags":["advisory"]},{"url":"https://mattermost.com/security-updates"},{"url":"https://github.com/advisories/GHSA-7qj9-mfh7-vg26"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/2xxx/CVE-2023-2793.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-2793","title":"Stack exhaustion in PreparePostForClientWithEmbedsAndImages","description":"Mattermost fails to validate links on external websites when constructing a preview for a linked website, allowing an attacker to cause a denial-of-service by a linking to a specially crafted webpage in a message.\n\n","status":"published","published":"2023-06-16T09:02:34.751Z","modified":"2024-12-06T23:00:16.89Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:35:24.004321Z"}],"euvd":[{"id":"EUVD-2023-34249","description":"Mattermost fails to validate links on external websites when constructing a preview for a linked website, allowing an attacker to cause a denial-of-service by a linking to a specially crafted webpage in a message.\n\n","status":"published","published":"2023-06-16T09:02:34Z","modified":"2024-12-06T23:00:16Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T00:04:38.652605Z"}],"ghsa":[{"id":"GHSA-7qj9-mfh7-vg26","title":"Mattermost fails to validate links on external websites when constructing a preview for a linked...","description":"Mattermost fails to validate links on external websites when constructing a preview for a linked website, allowing an attacker to cause a denial-of-service by a linking to a specially crafted webpage in a message.\n\n","status":"published","published":"2023-06-16T12:30:21Z","modified":"2024-04-04T04:54:38Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:56:28.408484Z"}],"nvd":[{"id":"CVE-2023-2793","description":"Mattermost fails to validate links on external websites when constructing a preview for a linked website, allowing an attacker to cause a denial-of-service by a linking to a specially crafted webpage in a message.\n\n","status":"published","published":"2023-06-16T10:15:09.27Z","modified":"2026-06-17T05:53:27.307Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:08:06.335469Z"}],"osv":[{"id":"CVE-2023-2793","title":"Stack exhaustion in PreparePostForClientWithEmbedsAndImages","description":"Mattermost fails to validate links on external websites when constructing a preview for a linked website, allowing an attacker to cause a denial-of-service by a linking to a specially crafted webpage in a message.\n\n","status":"published","published":"2023-06-16T09:02:34.751Z","modified":"2026-10-28T02:30:29.564341286Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:44:31.135751Z"}]}}