185 lines
7.2 KiB
JSON
185 lines
7.2 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-27656",
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"assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
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"state": "PUBLISHED",
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"assignerShortName": "Mattermost",
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"dateReserved": "2026-02-23T22:07:32.808Z",
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"datePublished": "2026-03-25T16:28:29.739Z",
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"dateUpdated": "2026-03-26T13:19:52.338Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"defaultStatus": "unaffected",
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"product": "Mattermost",
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"vendor": "Mattermost",
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"versions": [
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{
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"lessThanOrEqual": "11.4.0",
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"status": "affected",
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"version": "11.4.0",
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"versionType": "semver"
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},
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{
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"lessThanOrEqual": "11.3.1",
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"status": "affected",
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"version": "11.3.0",
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"versionType": "semver"
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},
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{
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"lessThanOrEqual": "11.2.3",
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"status": "affected",
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"version": "11.2.0",
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"versionType": "semver"
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},
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{
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"lessThanOrEqual": "10.11.11",
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"status": "affected",
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"version": "10.11.0",
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"versionType": "semver"
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},
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{
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"version": "11.5.0",
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"status": "unaffected"
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},
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{
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"version": "11.4.1",
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"status": "unaffected"
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},
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{
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"version": "11.3.2",
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"status": "unaffected"
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},
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{
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"version": "11.2.4",
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"status": "unaffected"
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},
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{
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"version": "10.11.12",
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"status": "unaffected"
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}
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]
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Christopher Poile"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow.. Mattermost Advisory ID: MMSA-2026-00590"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"attackVector": "NETWORK",
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"attackComplexity": "HIGH",
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"privilegesRequired": "HIGH",
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"userInteraction": "REQUIRED",
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"scope": "UNCHANGED",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "HIGH",
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"availabilityImpact": "NONE",
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N",
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"baseSeverity": "MEDIUM",
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"baseScore": 5.7
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"description": "CWE-303: Incorrect Implementation of Authentication Algorithm",
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"cweId": "CWE-303"
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}
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]
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}
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],
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"references": [
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{
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"url": "https://mattermost.com/security-updates",
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"name": "MMSA-2026-00590",
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"tags": [
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"vendor-advisory"
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]
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}
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],
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"solutions": [
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{
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"value": "Update Mattermost to versions 11.5.0, 11.4.1, 11.3.2, 11.2.4, 10.11.12 or higher.",
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"lang": "en"
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}
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],
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"source": {
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"advisory": "MMSA-2026-00590",
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"defect": [
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"https://mattermost.atlassian.net/browse/MM-67181"
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],
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"discovery": "{\"self\"=>\"https://mattermost.atlassian.net/rest/api/2/customFieldOption/10557\", \"value\"=>\"Internal\", \"id\"=>\"10557\"}"
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},
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"title": "Account Takeover via Substring Matching in OpenID Connect Authentication",
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"providerMetadata": {
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"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
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"shortName": "Mattermost",
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"dateUpdated": "2026-03-25T16:28:29.739Z"
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},
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-03-26T03:55:33.452102Z",
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"id": "CVE-2026-27656",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-03-26T13:19:52.338Z"
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}
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}
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]
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}
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} |