CVE-2026-39960

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-39960", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-07T22:40:33.822Z", "datePublished": "2026-05-20T21:11:02.341Z", "dateUpdated": "2026-05-21T13:30:07.497Z"}, "containers": {"cna": {"title": "MantisBT is Vulnerable to Stored XSS through Custom Field Textarea Values", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-qj6w-v29q-4rgx", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-qj6w-v29q-4rgx"}, {"name": "https://github.com/mantisbt/mantisbt/commit/5fec0f448b7a7d7d539a6adb6dccceac4e4e4ab7", "tags": ["x_refsource_MISC"], "url": "https://github.com/mantisbt/mantisbt/commit/5fec0f448b7a7d7d539a6adb6dccceac4e4e4ab7"}], "affected": [{"vendor": "mantisbt", "product": "mantisbt", "versions": [{"version": "< 2.28.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-20T21:11:02.341Z"}, "descriptions": [{"lang": "en", "value": "Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and below contain flawed logic that causes improper escaping of a textarea custom field's contents in the Update Issue page, (bug_update_page.php) allowing an attacker to inject HTML and, if CSP settings permit, execute arbitrary JavaScript when the page is loaded. This facilitates session theft, leading to admin account takeover, full project data access. In order to exploit this issue, a textarea-type custom field must be configured for the project, the attack must be carried out by an authenticated user with bug report permission (low privilege). This can affect any user viewing the bug edit form, including administrators. The issue has been fixed in version 2.28.2. If users cannot immediately upgrade, they can work around the issue by using the default Content-Security Policy, which blocks script execution."}], "source": {"advisory": "GHSA-qj6w-v29q-4rgx", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-21T13:29:35.775357Z", "id": "CVE-2026-39960", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-21T13:30:07.497Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-39960", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-21T13:29:35.775357Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-21T13:29:54.464Z"}}], "cna": {"title": "MantisBT is Vulnerable to Stored XSS through Custom Field Textarea Values", "source": {"advisory": "GHSA-qj6w-v29q-4rgx", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "mantisbt", "product": "mantisbt", "versions": [{"status": "affected", "version": "< 2.28.2"}]}], "references": [{"url": "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-qj6w-v29q-4rgx", "name": "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-qj6w-v29q-4rgx", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/mantisbt/mantisbt/commit/5fec0f448b7a7d7d539a6adb6dccceac4e4e4ab7", "name": "https://github.com/mantisbt/mantisbt/commit/5fec0f448b7a7d7d539a6adb6dccceac4e4e4ab7", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and below contain flawed logic that causes improper escaping of a textarea custom field's contents in the Update Issue page, (bug_update_page.php) allowing an attacker to inject HTML and, if CSP settings permit, execute arbitrary JavaScript when the page is loaded. This facilitates session theft, leading to admin account takeover, full project data access. In order to exploit this issue, a textarea-type custom field must be configured for the project, the attack must be carried out by an authenticated user with bug report permission (low privilege). This can affect any user viewing the bug edit form, including administrators. The issue has been fixed in version 2.28.2. If users cannot immediately upgrade, they can work around the issue by using the default Content-Security Policy, which blocks script execution."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-79", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-20T21:11:02.341Z"}}}, "cveMetadata": {"cveId": "CVE-2026-39960", "state": "PUBLISHED", "dateUpdated": "2026-05-21T13:30:07.497Z", "dateReserved": "2026-04-07T22:40:33.822Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-05-20T21:11:02.341Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "mantisbt", "vendor": "mantisbt", "versions": [{"status": "affected", "version": "< 2.28.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and below contain flawed logic that causes improper escaping of a textarea custom field's contents in the Update Issue page, (bug_update_page.php) allowing an attacker to inject HTML and, if CSP settings permit, execute arbitrary JavaScript when the page is loaded. This facilitates session theft, leading to admin account takeover, full project data access. In order to exploit this issue, a textarea-type custom field must be configured for the project, the attack must be carried out by an authenticated user with bug report permission (low privilege). This can affect any user viewing the bug edit form, including administrators. The issue has been fixed in version 2.28.2. If users cannot immediately upgrade, they can work around the issue by using the default Content-Security Policy, which blocks script execution."}, {"lang": "es", "value": "Mantis Bug Tracker (MantisBT) es un rastreador de problemas de c\u00f3digo abierto. Las versiones 2.28.1 e inferiores contienen l\u00f3gica defectuosa que causa un escape incorrecto del contenido de un campo personalizado de tipo textarea en la p\u00e1gina de Actualizaci\u00f3n de Incidencias (bug_update_page.PHP), permitiendo a un atacante inyectar HTML y, si la configuraci\u00f3n de CSP lo permite, ejecutar JavaScript arbitrario cuando se carga la p\u00e1gina. Esto facilita el robo de sesi\u00f3n, lo que lleva a la toma de control de la cuenta de administrador y acceso total a los datos del proyecto. Para explotar este problema, debe configurarse un campo personalizado de tipo textarea para el proyecto, y el ataque debe ser llevado a cabo por un usuario autenticado con permiso para informar errores (privilegio bajo). Esto puede afectar a cualquier usuario que vea el formulario de edici\u00f3n de errores, incluidos los administradores. El problema ha sido solucionado en la versi\u00f3n 2.28.2. Si los usuarios no pueden actualizar inmediatamente, pueden solucionar el problema utilizando la Pol\u00edtica de Seguridad de Contenido predeterminada, que bloquea la ejecuci\u00f3n de scripts."}], "id": "CVE-2026-39960", "lastModified": "2026-07-23T15:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39960", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-21T13:29:35.775357Z", "version": "2.0.3"}}]}, "published": "2026-05-20T22:16:36.563", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/mantisbt/mantisbt/commit/5fec0f448b7a7d7d539a6adb6dccceac4e4e4ab7"}, {"source": "security-advisories@github.com", "url": "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-qj6w-v29q-4rgx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.28.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "mantisbt", "source": "cna", "vendor": "mantisbt"}, "product": "mantisbt", "vendor": "mantisbt"}], "created": "2026-05-20T22:30:40.726886+00:00", "updated": "2026-05-20T23:00:15.266829+00:00", "vendors": ["mantisbt", "mantisbt$PRODUCT$mantisbt"]}