---
id: CVE-2023-41050
aliases:
  - GHSA-8xv7-89vj-q48c
  - PYSEC-2026-2075
title: Information disclosure in AccessControl
summary: Information disclosure in AccessControl
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N'
vendor: accesscontrol
product: accesscontrol
ecosystem: pip
affected:
  - accesscontrol < 4.4
  - zope < 4.8.9
  - 'accesscontrol >= 5.0, < 5.8'
  - 'accesscontrol >= 6.0, < 6.2'
  - 'zope >= 5.0.0, < 5.8.4'
patched:
  - accesscontrol 4.4
  - zope 4.8.9
  - accesscontrol 5.8
  - accesscontrol 6.2
  - zope 5.8.4
published: '2023-09-07'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-8xv7-89vj-q48c'
references:
  - url: >-
      https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-8xv7-89vj-q48c
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-41050'
  - url: >-
      https://github.com/zopefoundation/AccessControl/commit/6bc32692e0d4b8d5cf64eae3d19de987c7375bc9
  - url: 'https://github.com/zopefoundation/AccessControl'
tags:
  - osv
  - pip
epss: 0.00641
epssPercentile: 0.48495
ingestedAt: '2026-07-08T18:25:47.570Z'
---

## Overview

### Impact
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.

### Patches
A fix will be introduced in the versions 4.4, 5.8 and 6.2.

### Workarounds
There are no workarounds.

### References
https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-xjw2-6jm9-rf67 describes the corresponding problem for `RestrictedPython`.


## Affected packages

- `accesscontrol < 4.4`
- `zope < 4.8.9`
- `accesscontrol >= 5.0, < 5.8`
- `accesscontrol >= 6.0, < 6.2`
- `zope >= 5.0.0, < 5.8.4`

## Remediation

Upgrade to a patched release:

- `accesscontrol 4.4`
- `zope 4.8.9`
- `accesscontrol 5.8`
- `accesscontrol 6.2`
- `zope 5.8.4`