CVE-2023-41050: Zope Accesscontrol

High severity, CVSS 7.7. EPSS: 0.6% chance of exploitation in the next 30 days.

AccessControl provides a general security framework for use in Zope. Python's "format" functionality allows someone controlling the format string to "read" objects accessible (recursively) via attribute access and subscription from accessible objects. Those attribute accesses and subscriptions use Python's full blown `getattr` and `getitem`, not the policy restricted `AccessControl` variants `_getattr_` and `_getitem_`. This can lead to critical information disclosure. `AccessControl` already provides a safe variant for `str.format` and denies access to `string.Formatter`. However, `str.format_map` is still unsafe. Affected are all users who allow untrusted users to create `AccessControl` controlled Python code and execute it. A fix has been introduced in versions 4.4, 5.8 and 6.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• Zope Accesscontrol: before 4.4 (fixed in 4.4); from 5.0, before 5.8 (fixed in 5.8); from 6.0, before 6.2 (fixed in 6.2)
• Zope Zope: before 4.8.9 (fixed in 4.8.9); from 5.0, before 5.8.4 (fixed in 5.8.4)

Published 2023-09-06. Last modified 2026-06-17.