Critical (9.8) in atlassian bamboo. EPSS 2.3% chance of exploitation in the next 30 days.
The Ignite Realtime Smack XMPP API, as used in Atlassian Bamboo before 5.9.9 and 5.10.x before 5.10.0, allows remote configured XMPP servers to execute arbitrary Java code via serialized data in an XMPP message.
Severity
CVSS 3.0
9.8 critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
2.3% chance of exploitation in the next 30 days; higher than 83% of CVEs (scores of 2026-10-31)