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CVE-2026-42857

Open edX Platform enables the authoring and delivery of online learning at any scale. The HTML sanitizer clean_thread_html_body() used for discussion notification emails fails to remove <style> tags from user-generated discussion post content. This content is rendered with Django's |safe template filter in email notification templates, allowing any enrolled student to inject arbitrary CSS into email notifications sent to other users. This enables email tracking (IP address disclosure), content s
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2b489cb671486d9e3e46befdf0f850f13dc84b3142e8221c738701442226d570
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"openedx-platform","vendor":"openedx","versions":[{"status":"affected","version":"< cddc25cd791bb78f76833896e4778f668861df12"},{"status":"affected","version":">= sumac, < ulmo"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d2766be3a4ce573bfa714c26ed9c7f96ec43af96cd8aee66a7fa2fe029180cc6 · sha256:5012392124548014… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.6,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d2766be3a4ce573bfa714c26ed9c7f96ec43af96cd8aee66a7fa2fe029180cc6 · sha256:5012392124548014… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d2766be3a4ce573bfa714c26ed9c7f96ec43af96cd8aee66a7fa2fe029180cc6 · sha256:5012392124548014… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/openedx/openedx-platform/commit/cddc25cd791bb78f76833896e4778f668861df12","tags":["x_refsource_MISC"],"url":"https://github.com/openedx/openedx-platform/commit/cddc25cd791bb78f76833896e4778f668861df12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d2766be3a4ce573bfa714c26ed9c7f96ec43af96cd8aee66a7fa2fe029180cc6 · sha256:5012392124548014… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-4xv3-5j4x-q8g4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d2766be3a4ce573bfa714c26ed9c7f96ec43af96cd8aee66a7fa2fe029180cc6 · sha256:5012392124548014… · /containers/adp/0/references/0
{"name":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-4xv3-5j4x-q8g4","tags":["x_refsource_CONFIRM"],"url":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-4xv3-5j4x-q8g4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d2766be3a4ce573bfa714c26ed9c7f96ec43af96cd8aee66a7fa2fe029180cc6 · sha256:5012392124548014… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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