High (7.2). EPSS 31% chance of exploitation in the next 30 days.
Horde IMP through 6.2.27, as used with Horde Application Framework through 5.2.23, allows XSS that leads to account takeover via a crafted text/html e-mail message with an onerror attribute (that may use base64-encoded JavaScript code), as exploited in the wild in March 2025.
Severity
CVSS 3.1
7.2 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
EPSS
31% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-11-01)