PYSEC-2026-2879

    Dashboard / Vulnerabilities / PYSEC-2026-2879

    PYSEC-2026-2879

    Published: 9 Jul 2026Last Modified: 13 Jul 2026

    Summary: Improper Restriction of XML External Entity Reference in Plone

    Details: Plone before 5.2.3 allows XXE attacks via a feature that is protected by an unapplied permission of plone.schemaeditor.ManageSchemata (therefore, only available to the Manager role).

    References: https://nvd.nist.gov/vuln/detail/CVE-2020-28736, https://github.com/plone/Products.CMFPlone/issues/3209, https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt, https://github.com/advisories/GHSA-2c8c-84w2-j38j, https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2020-248.yaml, https://www.misakikata.com/codes/plone/python-en.html, https://pypi.org/project/plone-app-dexterity

    Affected packages

    Package

    Name: plone-app-dexterity

    Purl: pkg:pypi/plone-app-dexterity

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.6.8

    Affected versions

    1.0
    1.0.1
    1.0.2
    1.0.3

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    PYSEC-2026-2879 | CVE-DB