CVE-2026-73428

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{"affected": [{"affectedData": [{"product": "trix", "vendor": "basecamp", "versions": [{"status": "affected", "version": "< 2.1.18"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.18, Trix is vulnerable to stored cross-site scripting when crafted HTML is pasted into the editor. HTMLParser processes a mock attachment in a `<span>` with an empty `data-trix-attachment=\"{}\"` value, causing data-trix-attributes to be applied to a plain string piece. StringPiece.fromJSON accepts an unvalidated href, allowing a javascript: URI to enter the document model and serialized HTML and execute when another user renders and clicks the content. Applications that apply server-side HTML sanitization can neutralize the payload on save. This issue is fixed in version 2.1.18."}], "id": "CVE-2026-73428", "lastModified": "2026-09-18T20:09:01.757", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-73428", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-14T17:39:35.455077Z", "version": "2.0.3"}}]}, "published": "2026-08-13T22:17:26.587", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c"}, {"source": "security-advisories@github.com", "url": "https://github.com/basecamp/trix/pull/1293"}, {"source": "security-advisories@github.com", "url": "https://github.com/basecamp/trix/releases/tag/v2.1.18"}, {"source": "security-advisories@github.com", "url": "https://github.com/basecamp/trix/security/advisories/GHSA-53g2-mvcc-q9x3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "trix: action_text-trix: Trix: Stored Cross-Site Scripting via HTML paste allows arbitrary code execution.", "id": "2515813", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515813"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-79", "details": ["A flaw was found in Trix, a what-you-see-is-what-you-get rich text editor. A remote attacker can exploit this stored cross-site scripting (XSS) vulnerability by pasting specially crafted HTML into the editor. This allows a malicious javascript: Uniform Resource Identifier (URI) to be embedded, which can then execute arbitrary code in the victim's browser when another user renders and clicks the content."], "mitigation": {"lang": "en:us", "value": "Applications that apply server-side HTML sanitization can neutralize the XSS payload on save, preventing exploitation even on unpatched versions of Trix."}, "name": "CVE-2026-73428", "public_date": "2026-08-13T22:04:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-73428\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-73428\nhttps://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c\nhttps://github.com/basecamp/trix/pull/1293\nhttps://github.com/basecamp/trix/releases/tag/v2.1.18\nhttps://github.com/basecamp/trix/security/advisories/GHSA-53g2-mvcc-q9x3"], "statement": "No Red Hat products ship a vulnerable version of this component.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.1.18)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "trix", "source": "cna", "vendor": "basecamp"}, "product": "trix", "vendor": "basecamp"}], "created": "2026-08-13T23:45:16.688308+00:00", "updated": "2026-08-14T01:00:05.195840+00:00", "vendors": ["basecamp", "basecamp$PRODUCT$trix"]}