CVE-2023-41050

Information disclosure through Python's "format" functionality in Zope AccessControl

HIGH

7.7

CVSS Score

Published: September 6, 2023 at 05:58 PM UTC

Updated: June 17, 2026 at 06:20 AM UTC

3 products affected across 2 vendorsZopeAccesscontrolAccessControl

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Severity

HIGH7.7

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Accesscontrol · Zope

95%

v < 4.45.0 ≤ v < 5.86.0 ≤ v < 6.2

Affected range stops below 4.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2, so it looks safe — our inference, not a vendor statement

Zope · Zope

95%

v < 4.8.95.0 ≤ v < 5.8.4

Affected range stops below 4.8.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.8.4, so it looks safe — our inference, not a vendor statement

AccessControl · Zopefoundation

60%

v < 4.4v < 4.8.9v < 5.8v < 5.8.4v < 6.2

Affected range stops below 4.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.8.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.8.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatch

Source: [email protected]

https://github.com/zopefoundation/AccessControl/commit/6bc32692e0d4b8d5cf64eae3d19de987c7375bc9

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-8xv7-89vj-q48c

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.7HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: CHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-200

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