CVE-2026-31281

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "cveTags": [{"sourceIdentifier": "cve@mitre.org", "tags": ["disputed"]}], "descriptions": [{"lang": "en", "value": "Totara LMS v19.1.5 and before is vulnerable to HTML Injection. An attacker can inject malicious HTML code in a message and send it to all the users in the application, resulting in executing the code and may lead to session hijacking and executing commands on the victim's browser. NOTE: The supplier states that the product name is Totara Learning and that the functionality referenced is the in app messaging client. They note that the in app messaging client only has the ability to embed a specific allowed list of HTML tags commonly used for text enhancement, which includes italic, bold, underline, strong, etc. Last, they state that the in app messaging client cannot embed <script>, <style>, <iframe>, <object>, <embed>, <form>, <input>, <button>, <svg>, <math>, etc., and any attempt to embed tags or attributes outside of the allowed list (including onerror, onaction, etc.) is sanitized via DOMPurify."}], "id": "CVE-2026-31281", "lastModified": "2026-06-17T10:33:34.207", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31281", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-14T15:44:48.124739Z", "version": "2.0.3"}}]}, "published": "2026-04-13T15:17:32.973", "references": [{"source": "cve@mitre.org", "url": "https://github.com/saykino/CVE-2026-31281"}, {"source": "cve@mitre.org", "url": "https://www.totara.com/"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,19.1.5]"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "lms", "vendor": "totara"}], "analysis": {"en": {"generated_at": "2026-04-28T21:37:31.125736+00:00", "value": {"mitigation_remediation": ["Apply the latest Totara LMS release that removes the HTML injection flaw in the messaging client.", "If a patch cannot be applied immediately, block or restrict the ability for users to post raw HTML in messages, or enforce stricter sanitization on message input.", "Verify that all custom themes and third\u2011party plugins perform proper HTML sanitization before rendering messages, and upgrade them to secure versions.", "Consider disabling public messaging or monitoring for suspicious script tags until the vulnerability is patched.", "Consult Totara support or official advisory channels for additional guidance and patch availability notices."], "summary": {"action": "Immediate Update", "impact": "Cross\u2011Site Scripting allowing session hijacking and client\u2011side command execution"}, "threat_synthesis": {"affected_systems": "All installations of Totara LMS running version 19.1.5 or older, regardless of deployment environment, are affected, as the flaw resides in the core messaging module.", "description_and_impact": "In Totara Learning Management System version 19.1.5 and earlier, the in\u2011app messaging client accepts user\u2011supplied HTML without fully sanitizing it, enabling an attacker to embed malicious tags in a message. When recipients view the message, the code runs in their browser, leading to Cross\u2011Site Scripting, session hijacking, and possible client\u2011side command execution. The weakness is a classic XSS, classified as CWE\u201179.", "risk_and_exploitability": "The CVSS score of 8.0 reflects high impact, while the EPSS score indicates a low exploitation probability (<\u202f1\u202f%). The vulnerability is not listed in CISA\u2019s KEV catalogue. Based on the description, it is inferred that the attack requires an authenticated user with permission to post messages, as the attacker must embed malicious HTML in a message that is then distributed to all users. Once a recipient opens the message, the payload executes in their browser, enabling session hijack and client\u2011side command execution."}}}}, "created": "2026-04-14T16:22:09.849783+00:00", "title": "Totara LMS In\u2011App Messaging HTML Injection Leading to Cross\u2011Site Scripting", "updated": "2026-04-28T21:45:26.142699+00:00", "vendors": ["totara", "totara$PRODUCT$lms"]}