Bug 2537896 (CVE-2026-79312)

Summary: CVE-2026-79312 python-webpy: webpy: Missing session ID rotation after authentication leads to session fixation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in webpy. The session component reads the session identifier from the request cookie and reuses it across authentication state changes without ever rotating it. This allows a pre-authentication session identifier to persist into the authenticated session, enabling an attacker who knows that identifier to access the victim's session after they log in.
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Bug Depends On: 2540021    
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Description OSIDB Bzimport 2026-09-22 15:59:01 UTC 
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.