{"id":"EUVD-2026-30742","enisaUuid":"4c58610b-2571-3571-bd47-0be977e4580e","description":"Mattermost versions 11.5.x \u003c\u003d 11.5.1, 10.11.x \u003c\u003d 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attacker with access to edit some site configuration to execute some malicious code via injecting some JS as part of those values.. Mattermost Advisory ID: MMSA-2026-00622","datePublished":"May 18, 2026, 6:58:29 AM","dateUpdated":"May 18, 2026, 2:33:30 PM","baseScore":3.8,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","references":"https://mattermost.com/security-updates\n","aliases":"CVE-2026-3495\nGHSA-jx93-pf6x-874r\n","assigner":"Mattermost","epss":0.14,"enisaIdProduct":[{"id":"f92cacb1-bc02-3781-b699-3da537c72ea7","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.5.0 ≤11.5.1"},{"id":"fc98e12e-0c3a-3180-a21b-ad41b1cab96b","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.13"}],"enisaIdVendor":[{"id":"0c10da59-5e8e-3353-bae1-4bb7da270560","vendor":{"name":"Mattermost"}}],"enisaIdVulnerability":[{"id":"c8478bd3-ce1e-355a-a45a-5a0d50d5acf7","vulnerability":{"id":"CVE-2026-3495","description":"Mattermost versions 11.5.x \u003c\u003d 11.5.1, 10.11.x \u003c\u003d 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attacker with access to edit some site configuration to execute some malicious code via injecting some JS as part of those values.. Mattermost Advisory ID: MMSA-2026-00622","datePublished":"May 18, 2026, 6:58:29 AM","dateUpdated":"May 18, 2026, 2:33:30 PM","status":"PUBLISHED","baseScore":3.8,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","references":"https://mattermost.com/security-updates\n","enisa_id":"EUVD-2026-30742\n","assigner":"Mattermost","epss":0.14,"dataProcessed":"Nov 1, 2026, 7:17:30 AM","vulnerabilityProduct":[{"id":"57149963-6bec-381a-9d3f-fa7582260c60","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.5.0 ≤11.5.1"},{"id":"857a57df-b396-34ff-8186-bd082d198552","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.13"}],"vulnerabilityVendor":[{"id":"f533f29d-4af1-368e-ba9b-22dae59f5a35","vendor":{"name":"Mattermost"}}]}},{"id":"dda6206c-7567-338e-b204-4539e11fb8af","vulnerability":{"id":"GHSA-jx93-pf6x-874r","description":"Mattermost doesn\u0027t escape some variables that could contain malicious content during error page composition","datePublished":"May 18, 2026, 9:31:47 AM","dateUpdated":"Jun 1, 2026, 3:00:04 PM","baseScore":0.0,"references":"https://nvd.nist.gov/vuln/detail/CVE-2026-3495\nhttps://github.com/mattermost/mattermost/commit/5a1ea95044dc2d1ca601bfe9a4c1bc17990f3872\nhttps://github.com/mattermost/mattermost\nhttps://mattermost.com/security-updates\n","enisa_id":"EUVD-2026-30742\n","aliases":"CVE-2026-3495\nGHSA-jx93-pf6x-874r\n","epss":0.0,"dataProcessed":"Nov 1, 2026, 2:00:21 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[]}