Medium (6.8). EPSS 0.3% chance of exploitation in the next 30 days.
webpy web.py 0.76 is vulnerable to Session Fixation. The component Session._load() reads session_id directly from the request cookie and loads that session from the store, and _save() writes back under the same session_id; no rotation after authentication, so a fixed session_id keeps the authenticated state.
Severity
CVSS 3.1
6.8 medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS
0.3% chance of exploitation in the next 30 days; higher than 21% of CVEs (scores of 2026-10-31)