Mahara 1.8 before 1.8.6 and 1.9 before 1.9.4 and 1.10 before 1.10.1 and 15.04 before 15.04.0 are vulnerable because group members can lose access to the group files they uploaded if another group member changes the access permissions on them.
Severity
CVSS 3.0
8.1 high
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS
0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)