CVE-2026-27210

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{"affected": [{"affectedData": [{"product": "pannellum", "vendor": "mpetroff", "versions": [{"status": "affected", "version": ">= 2.5.0, < 2.5.7"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:pannellum:pannellum:*:*:*:*:*:*:*:*", "matchCriteriaId": "E58003E4-E437-439F-8280-88C88912813E", "versionEndExcluding": "2.5.7", "versionStartIncluding": "2.5.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Pannellum is a lightweight, free, and open source panorama viewer for the web. In versions 3.5.0 through 2.5.6, the hot spot attributes configuration property allowed any attribute to be set, including HTML event handler attributes, allowing for potential XSS attacks. This affects websites hosting the standalone viewer HTML file and any other use of untrusted JSON config files (bypassing the protections of the escapeHTML parameter). As certain events fire without any additional user interaction, visiting a standalone viewer URL that points to a malicious config file \u2014 without additional user interaction \u2014 is sufficient to trigger the vulnerability and execute arbitrary JavaScript code, which can, for example, replace the contents of the page with arbitrary content and make it appear to be hosted by the website hosting the standalone viewer HTML file. This issue has been fixed in version 2.5.7. To workaround, setting the Content-Security-Policy header to script-src-attr 'none' will block execution of inline event handlers, mitigating this vulnerability. Don't host pannellum.htm on a domain that shares cookies with user authentication to mitigate XSS risk."}, {"lang": "es", "value": "Pannellum es un visor de panoramas ligero, gratuito y de c\u00f3digo abierto para la web. En las versiones 3.5.0 a 2.5.6, la propiedad de configuraci\u00f3n de atributos de punto de acceso permit\u00eda establecer cualquier atributo, incluyendo atributos de gestor de eventos HTML, lo que permit\u00eda posibles ataques XSS. Esto afecta a los sitios web que alojan el archivo HTML del visor independiente y a cualquier otro uso de archivos de configuraci\u00f3n JSON no confiables (eludiendo las protecciones del par\u00e1metro escapeHTML). Como ciertos eventos se disparan sin ninguna interacci\u00f3n adicional del usuario, visitar una URL de visor independiente que apunte a un archivo de configuraci\u00f3n malicioso \u2014 sin interacci\u00f3n adicional del usuario \u2014 es suficiente para activar la vulnerabilidad y ejecutar c\u00f3digo JavaScript arbitrario, que puede, por ejemplo, reemplazar el contenido de la p\u00e1gina con contenido arbitrario y hacer que parezca alojado por el sitio web que aloja el archivo HTML del visor independiente. Este problema ha sido solucionado en la versi\u00f3n 2.5.7. Como soluci\u00f3n alternativa, establecer el encabezado Content-Security-Policy a 'script-src-attr 'none'' bloquear\u00e1 la ejecuci\u00f3n de gestores de eventos en l\u00ednea, mitigando esta vulnerabilidad. No aloje pannellum.htm en un dominio que comparta cookies con la autenticaci\u00f3n de usuario para mitigar el riesgo de XSS."}], "id": "CVE-2026-27210", "lastModified": "2026-06-17T10:26:51.030", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27210", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-25T21:16:25.784176Z", "version": "2.0.3"}}]}, "published": "2026-02-21T06:17:01.083", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/mpetroff/pannellum/commit/9391ef8da6a6a98c6a9f8c97f101adb900523681"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/mpetroff/pannellum/security/advisories/GHSA-8423-w5wx-h2r6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.5.0,2.5.7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "pannellum", "source": "cna", "vendor": "mpetroff"}, "product": "pannellum", "vendor": "mpetroff"}], "analysis": {"en": {"generated_at": "2026-04-17T16:53:46.884888+00:00", "value": {"mitigation_remediation": ["Upgrade Pannellum to version 2.5.7 or later, which removes the ability to set arbitrary hotspot attributes.", "If an immediate upgrade is not feasible, configure the web server to send a Content\u2011Security\u2011Policy header that includes \u2018script\u2011src\u2011attr 'none'' to block inline event handlers from executing.", "Avoid serving the pannellum.htm file from any domain that shares authentication cookies; use a dedicated domain or subdomain to isolate the viewer from application session data."], "summary": {"action": "Patch", "impact": "Cross\u2011Site Scripting via hotspot event attributes"}, "threat_synthesis": {"affected_systems": "The issue exists in Pannellum versions 2.5.6 through 3.5.0 inclusive, distributed by mpetroff. Any deployment using the standalone viewer HTML file or untrusted JSON configuration falls within the affected range.", "description_and_impact": "Hotspot configuration in Pannellum allows any attribute to be set, including HTML event handler attributes that execute JavaScript without user interaction. This flaw enables a cross\u2011site scripting attack where visiting a malicious viewer URL or loading a JSON configuration file can run arbitrary code, modify page content, and impersonate the hosting site. The vulnerability is identified as CWE\u201179.", "risk_and_exploitability": "The CVSS score of 5.3 indicates moderate severity, while the EPSS score of less than 1% suggests a low but non\u2011zero likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog. Attacks can be launched simply by delivering a malicious hotspot configuration to visitors; no authentication or privileged access is required. The exploit path is straightforward: host the viewer, point it to a crafted configuration file, and observe the automatic execution of embedded JavaScript."}}}}, "created": "2026-02-23T14:32:40.685024+00:00", "updated": "2026-04-17T17:00:10.185451+00:00", "vendors": ["mpetroff", "mpetroff$PRODUCT$pannellum"]}