PYSEC-2026-2879

Vulnerability from pysec - Published: 2026-07-09 16:49 - Updated: 2026-07-13 16:05
VLAI
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).

Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Impacted products
Name purl
plone-app-dexterity pkg:pypi/plone-app-dexterity
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "plone-app-dexterity",
        "purl": "pkg:pypi/plone-app-dexterity"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0",
        "1.0.1",
        "1.0.2",
        "1.0.3",
        "1.0a1",
        "1.0a2",
        "1.0a3",
        "1.0a4",
        "1.0a5",
        "1.0a6",
        "1.0a7",
        "1.0b1",
        "1.0b2",
        "1.0b3",
        "1.0b4",
        "1.0rc1",
        "1.1",
        "1.2",
        "1.2.1",
        "1.2.2",
        "2.0",
        "2.0.1",
        "2.0.10",
        "2.0.11",
        "2.0.12",
        "2.0.13",
        "2.0.14",
        "2.0.15",
        "2.0.16",
        "2.0.17",
        "2.0.18",
        "2.0.19",
        "2.0.2",
        "2.0.3",
        "2.0.4",
        "2.0.5",
        "2.0.6",
        "2.0.7",
        "2.0.8",
        "2.0.9",
        "2.1.0",
        "2.1.1",
        "2.1.10",
        "2.1.11",
        "2.1.12",
        "2.1.13",
        "2.1.14",
        "2.1.15",
        "2.1.16",
        "2.1.17",
        "2.1.18",
        "2.1.19",
        "2.1.2",
        "2.1.20",
        "2.1.3",
        "2.1.4",
        "2.1.5",
        "2.1.6",
        "2.1.7",
        "2.1.8",
        "2.1.9",
        "2.2.0",
        "2.3.0",
        "2.3.1",
        "2.3.2",
        "2.3.3",
        "2.3.4",
        "2.3.5",
        "2.3.6",
        "2.3.7",
        "2.3.8",
        "2.3.9",
        "2.4.0",
        "2.4.1",
        "2.4.10",
        "2.4.2",
        "2.4.3",
        "2.4.4",
        "2.4.5",
        "2.4.6",
        "2.4.7",
        "2.4.8",
        "2.4.9",
        "2.5.0",
        "2.5.1",
        "2.5.2",
        "2.5.3",
        "2.6.0",
        "2.6.1",
        "2.6.2",
        "2.6.3",
        "2.6.4",
        "2.6.5",
        "2.6.6",
        "2.6.7"
      ]
    }
  ],
  "aliases": [
    "CVE-2020-28736",
    "GHSA-2c8c-84w2-j38j"
  ],
  "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).",
  "id": "PYSEC-2026-2879",
  "modified": "2026-07-13T16:05:34.708863Z",
  "published": "2026-07-09T16:49:33.354568Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28736"
    },
    {
      "type": "WEB",
      "url": "https://github.com/plone/Products.CMFPlone/issues/3209"
    },
    {
      "type": "WEB",
      "url": "https://dist.plone.org/release/5.2.3/RELEASE-NOTES.txt"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-2c8c-84w2-j38j"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2020-248.yaml"
    },
    {
      "type": "WEB",
      "url": "https://www.misakikata.com/codes/plone/python-en.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/plone-app-dexterity"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Improper Restriction of XML External Entity Reference in Plone"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.