mime.php in SquirrelMail through 1.4.23-svn-20250401 and 1.5.x through 1.5.2-svn-20250401 allows XSS via e-mail headers, because JavaScript payloads are mishandled after $encoded has been set to true.
CVE ID: CVE-2025-30090
CVSS Base Severity: HIGH
CVSS Base Score: 7.2
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Vendor: SquirrelMail
Product: SquirrelMail
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 10.7% (scored less or equal to compared to others)
EPSS Date: 2025-05-01 (when was this score calculated)