{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-24906", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-01-27T19:35:20.530Z", "datePublished": "2026-04-14T17:23:20.461Z", "dateUpdated": "2026-04-16T13:46:05.447Z"}, "containers": {"cna": {"title": "October CMS has Stored XSS in its Backend Editor Markup Classes", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 5.1, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/octobercms/october/security/advisories/GHSA-6qmh-j78v-ffp7", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/octobercms/october/security/advisories/GHSA-6qmh-j78v-ffp7"}], "affected": [{"vendor": "octobercms", "product": "october", "versions": [{"version": "< 3.7.14", "status": "affected"}, {"version": ">= 4.0.0, < 4.1.10", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-14T17:23:20.461Z"}, "descriptions": [{"lang": "en", "value": "October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a Stored Cross-Site Scripting (XSS) vulnerability in the Backend Editor Settings. The Markup Classes fields (used for paragraph styles, inline styles, table styles, etc.) did not sanitize input to valid CSS class name characters. Malicious values were rendered unsanitized in Froala editor dropdown menus, allowing JavaScript execution when any user opened a RichEditor. Exploitation could lead to privilege escalation if a superuser opens any RichEditor during routine content editing (e.g., editing a blog post), and requires authenticated backend access with editor settings permissions. This issue has been fixed in versions 3.7.14 and 4.1.10. To workaround this issue, restrict editor settings permissions to fully trusted administrators only"}], "source": {"advisory": "GHSA-6qmh-j78v-ffp7", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-16T13:45:53.227273Z", "id": "CVE-2026-24906", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-16T13:46:05.447Z"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.7.14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.1.10)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "october", "source": "cna", "vendor": "octobercms"}, "product": "october", "vendor": "octobercms"}], "analysis": {"en": {"generated_at": "2026-04-14T20:34:01.243027+00:00", "value": {"mitigation_remediation": ["Upgrade October CMS to version 3.7.14 or 4.1.10 or later", "If upgrading is not immediately possible, restrict editor settings permissions to fully trusted administrators only as a temporary measure", "Verify that no existing content contains malicious CSS class values in the editor", "Monitor logs for attempts to inject unexpected markup classes and review editor usage after applying the fix"], "summary": {"action": "Patch immediately", "impact": "Stored XSS that can execute JavaScript when a privileged user opens a RichEditor"}, "threat_synthesis": {"affected_systems": "The flaw impacts October CMS products from the October vendor, specifically all releases older than 3.7.14 and 4.1.10. Any deployment of these versions that allows editing of content via the Backend Editor is susceptible unless the editor settings permissions have already been restricted to trusted administrators.", "description_and_impact": "October CMS versions before 3.7.14 and 4.1.10 embed unsanitized input from the Markup Classes fields into the Froala editor dropdowns. The vulnerability allows a user to place malicious JavaScript payloads in CSS class attributes. When a user with editor setting permissions opens a RichEditor, the script runs in the victim\u2019s browser, potentially leading to higher privilege use or session hijacking. The weakness is a stored cross\u2011site scripting flaw.", "risk_and_exploitability": "The CVSS base score is 5.1, indicating moderate severity. Exploitation requires authenticated backend access with editor settings permissions, so the likelihood is limited to users granted those rights. No EPSS score is reported, and the vulnerability is not listed in the CISA KEV catalog. The attack vector is therefore constrained to legitimate administrators; however, the impact could allow privilege escalation if a superuser triggers the vulnerable editor. The known fix exists in the stated versions, and in its absence a corrective workaround can be applied by limiting editor settings permissions."}}}}, "created": "2026-04-15T14:31:56.909416+00:00", "updated": "2026-04-15T14:41:09.781126+00:00", "vendors": ["octobercms", "octobercms$PRODUCT$october"]}