{"id":"CVE-2026-113583","summary":"Cypht 2.0.0 through 2.12.2 Stored DOM XSS via externalResources.js","details":"Cypht webmail 2.0.0 through 2.12.2 contains a DOM-based cross-site scripting vulnerability that allows remote attackers to execute arbitrary JavaScript by crafting malicious alt text or URL values in an HTML email's external image tag when ALLOW_EXTERNAL_IMAGE_SOURCES is enabled. Attackers can send a specially crafted email so that when the victim opens it, the externalResources.js code builds the blocked-image notice using innerHTML with decoded email-derived values, triggering script execution in the victim's authenticated session to read mailboxes, send email, or change settings.","modified":"2026-10-23T10:30:48.994225394Z","published":"2026-10-20T11:35:29.543Z","database_specific":{"cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113583.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113583.json"},{"type":"PACKAGE","url":"https://github.com/cypht-org/cypht"},{"type":"REPORT","url":"https://github.com/cypht-org/cypht/pull/2118/changes/75d2fb83d228be2aaa37036a11eea68d82122d85"},{"type":"FIX","url":"https://github.com/cypht-org/cypht/releases#release-v2.13.0"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113583"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/cypht-through-stored-dom-xss-via-externalresources-js"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cypht-org/cypht","events":[{"introduced":"492f6346849fb9bc5cdca5fb9cd88ae24c296fd7"},{"fixed":"4caf0a64a4d4b1b2756ea05e3883aacac16babc2"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"2.0.0"},{"fixed":"2.13.0"}]}]}}],"versions":["v2.12.0","v2.11.0","v2.5.0","v2.2.0","v2.1.0","v2.0.1","v2.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-113583.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}