{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-115351", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-22T11:20:02.626Z", "datePublished": "2026-10-22T19:13:27.678Z", "dateUpdated": "2026-10-22T19:13:27.678Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-22T19:13:27.678Z"}, "datePublic": "2026-06-21T00:00:00.000Z", "title": "Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option", "descriptions": [{"lang": "en", "value": "Mistune from 3.2.1 before 3.3.0 contains a CSS injection vulnerability that allows attackers controlling markdown input to inject arbitrary style declarations via the unvalidated figwidth option of the figure directive. Attackers can append declarations like background:url() to the rendered figure style attribute, forcing victim browsers to send requests to attacker servers and leak attribute values."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Control of Generation of Code ('Code Injection')", "cweId": "CWE-94", "type": "CWE"}]}], "affected": [{"vendor": "lepture", "product": "mistune", "defaultStatus": "unaffected", "packageURL": "pkg:pypi/mistune", "versions": [{"version": "3.2.1", "status": "affected", "versionType": "semver", "lessThan": "3.3.0"}, {"version": "3.3.0", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2.1", "versionEndExcluding": "3.3.0"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/lepture/mistune/security/advisories/GHSA-xmwc-wjpr-q378", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-xmwc-wjpr-q378)"}, {"name": "VulnCheck Advisory: Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/mistune-3.2.1-before-3.3.0-css-injection-via-figure-directive-figwidth-option"}], "credits": [{"lang": "en", "value": "offset", "type": "reporter"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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