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vuln-cve/data/2026/10xxx/CVE-2026-10542.json
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"state": "PUBLISHED",
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"dateReserved": "2026-06-01T12:34:54.592Z",
"datePublished": "2026-09-14T10:37:32.147Z",
"dateUpdated": "2026-09-14T11:19:45.549Z"
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"value": "Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate channel action ownership which allows channel managers to update actions in other channels via the channel action update endpoint.. Mattermost Advisory ID: MMSA-2026-00692"
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"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"availabilityImpact": "LOW",
"version": "3.1",
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"value": "GENERAL"
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"type": "CWE",
"description": "CWE-639: Authorization Bypass Through User-Controlled Key",
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"url": "https://mattermost.com/security-updates",
"name": "MMSA-2026-00692",
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"lang": "en"
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"source": {
"advisory": "MMSA-2026-00692",
"defect": [
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"discovery": "EXTERNAL"
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"title": "Playbooks channel action update validation issue",
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"role": "CISA Coordinator",
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"Automatable": "no"
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"version": "2.0.3",
"timestamp": "2026-09-14T11:02:43.768854Z"
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"title": "CISA ADP Vulnrichment",
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