{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "\u003e= release/redwood.1, \u003c release/ulmo.4"
              },
              {
                "last_affected": "\u003e= release/redwood.1, \u003c release/ulmo.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "142bb24065fa23eeaf9806a560762aa00013f296"
            },
            {
              "fixed": "2af03d21b4142e53e375c7f3699b313e92ec5121"
            },
            {
              "fixed": "52f2b3bb3e6fac2601c29e8f926c81498d20bb0b"
            },
            {
              "fixed": "5eae6e51a8797cd3b87cc132f5de73d52561c4d7"
            }
          ],
          "repo": "https://github.com/openedx/openedx-platform",
          "type": "GIT"
        }
      ],
      "versions": [
        "\u003e= release/redwood.1, \u003c release/ulmo.4"
      ]
    }
  ],
  "aliases": [
    "GHSA-rv5w-f4r5-h77g"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85271.json"
  },
  "details": "Open edX Platform enables the authoring and delivery of online learning at any scale. From Redwood until Ulmo and Verawood.1, the add_additional_attributes_to_notifications function in openedx/core/djangoapps/notifications/email/utils.py assigns notification content without sanitizing discussion-title values produced by get_notification_content in openedx/core/djangoapps/notifications/base_notification.py. An enrolled student can place CSS-capable markup in the post_title value supplied by lms/djangoapps/discussion/rest_api/discussions_notifications.py. Digest and batched-email rendering then passes that value through openedx/core/djangoapps/notifications/templates/notifications/digest_content.html as safe HTML, allowing email-open tracking and content spoofing or phishing when another learner opens a CSS-rendering client. The immediate-email path is not affected because it strips title markup and renders a separately sanitized body. This issue is fixed in Ulmo and Verawood.1.",
  "id": "CVE-2026-85271",
  "modified": "2026-09-24T03:30:26.398363728Z",
  "published": "2026-09-18T20:38:40.422Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openedx/openedx-platform/releases/tag/release/ulmo.4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openedx/openedx-platform/releases/tag/release/verawood.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85271.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/openedx/openedx-platform/security/advisories/GHSA-rv5w-f4r5-h77g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85271"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openedx/openedx-platform/commit/2af03d21b4142e53e375c7f3699b313e92ec5121"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openedx/openedx-platform/commit/52f2b3bb3e6fac2601c29e8f926c81498d20bb0b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openedx/openedx-platform/commit/5eae6e51a8797cd3b87cc132f5de73d52561c4d7"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open edX Platform: Stored CSS Injection in Email Digest Notifications via Unsanitized Thread Title (incomplete patch of CVE-2026-42857)"
}