CVE-2026-32109

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{"affected": [{"affectedData": [{"product": "copyparty", "vendor": "9001", "versions": [{"status": "affected", "version": "< 1.20.12"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:9001:copyparty:*:*:*:*:*:*:*:*", "matchCriteriaId": "C5EE0A6C-C2FD-4A0D-A0AE-DFAFA3611249", "versionEndExcluding": "1.20.12", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Copyparty is a portable file server. Prior to 1.20.12, if an attacker has been given both read- and write-permissions to the server, they can upload a malicious file with the filename .prologue.html and then craft a link to potentially execute arbitrary JavaScript in the victim's context. Note that it is intended behavior that the JavaScript would execute if the target clicks a link to the HTML file itself; \"https://example.com/foo/.prologue.html\". The vulnerability is that \"https://example.com/foo/?b\" would also evaluate the file, making the behavior unexpected. There are existing preventative measures (strict SameSite cookies) which makes it harder to leverage this vulnerability in an attack; in order to gain control of the target's authenticated session, the link must be clicked from a page served by the server itself -- most likely by editing an existing resource, which would require additional access permissions. Finally, for this attack to be successful, the attacker's target must click the specific crafted link given by the attacker. This vulnerability is not activated by normally browsing the web-UI on the server. This vulnerability is fixed in 1.20.12."}, {"lang": "es", "value": "Copyparty es un servidor de archivos port\u00e1til. Antes de la versi\u00f3n 1.20.12, si a un atacante se le han otorgado permisos de lectura y escritura en el servidor, puede cargar un archivo malicioso con el nombre de archivo .prologue.html y luego elaborar un enlace para ejecutar potencialmente JavaScript arbitrario en el contexto de la v\u00edctima. Tenga en cuenta que es un comportamiento intencionado que el JavaScript se ejecute si el objetivo hace clic en un enlace al propio archivo HTML; 'https://example.com/foo/.prologue.html'. La vulnerabilidad es que 'https://example.com/foo/?b' tambi\u00e9n evaluar\u00eda el archivo, haciendo que el comportamiento sea inesperado. Existen medidas preventivas (cookies SameSite estrictas) que dificultan el aprovechamiento de esta vulnerabilidad en un ataque; para obtener el control de la sesi\u00f3n autenticada del objetivo, el enlace debe ser clicado desde una p\u00e1gina servida por el propio servidor -- muy probablemente editando un recurso existente, lo que requerir\u00eda permisos de acceso adicionales. Finalmente, para que este ataque sea exitoso, el objetivo del atacante debe hacer clic en el enlace espec\u00edfico elaborado por el atacante. Esta vulnerabilidad no se activa al navegar normalmente por la interfaz de usuario web en el servidor. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 1.20.12."}], "id": "CVE-2026-32109", "lastModified": "2026-06-17T10:35:09.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-32109", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-12T19:45:23.365303Z", "version": "2.0.3"}}]}, "published": "2026-03-11T21:16:16.913", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/9001/copyparty/security/advisories/GHSA-rcp6-88mm-9vgf"}], "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": "[0,1.20.12)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "copyparty", "source": "cna", "vendor": "9001"}, "product": "copyparty", "vendor": "9001"}], "analysis": {"en": {"generated_at": "2026-03-17T16:24:55.059058+00:00", "value": {"mitigation_remediation": ["Update Copyparty to version 1.20.12 or later.", "Revoke write permissions for untrusted users or restrict write access to the server\u2019s upload directories.", "Configure session cookies with SameSite=Strict to reduce the chance of session hijacking via crafted URLs.", "Avoid placing or serving .prologue.html files in publicly accessible directories.", "If an update is not possible, monitor for suspicious links containing query strings like '?b' and block or remove them."], "summary": {"action": "Apply Patch", "impact": "Cross\u2011Site Scripting"}, "threat_synthesis": {"affected_systems": "The issue affects Copyparty version 9001:copyparty prior to 1.20.12. All installations that have both read and write permissions for an attacker on a directory are vulnerable. The product is listed under cpe:2.3:a:9001:copyparty.", "description_and_impact": "This vulnerability allows an attacker who can write to the Copyparty server to upload a file named \".prologue.html\" containing malicious JavaScript. Normally the script would run only when the file is accessed directly via a URL such as https://example.com/foo/.prologue.html. However, the server also evaluates the file when accessing the directory with a query string, e.g., https://example.com/foo/?b. Consequently, an attacker can craft a link that causes the JavaScript to execute in an unsuspecting victim\u2019s browser. Because the script runs with the victim\u2019s authenticated session, the attacker can perform actions such as session hijacking, data exfiltration, or further exploitation. The weakness corresponds to CWE\u201179 (Cross\u2011Site Scripting).", "risk_and_exploitability": "The CVSS base score is 3.7, categorising the flaw as Low severity, and the EPSS score is less than 1%, indicating a low likelihood of exploitation in the wild. It is not present in the CISA KEV catalog. Exploitation requires the attacker to have write access to create .prologue.html and the victim to click a specific crafted link served by the same domain. While SameSite=Strict cookies reduce the risk, the attack is still feasible if the user interacts with the malicious link. Overall risk is moderate for environments with permissive write access, but low for strongly isolated configurations."}}}}, "created": "2026-03-12T09:56:12.327367+00:00", "updated": "2026-03-20T15:37:18.153715+00:00", "vendors": ["9001", "9001$PRODUCT$copyparty"]}