CVE-2026-85272

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (38th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 4.3Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Open edX Platform enables the authoring and delivery of online learning at any scale. From Aspen.1 until Ulmo and Verawood.1, openedx/core/lib/extract_archive.py uses _is_bad_path to validate safe_extractall targets by comparing resolved path strings with startswith instead of comparing path components. A course author or staff user with course import permission can submit a crafted .tar.gz archive through the import_olx flow initiated by cms.djangoapps.contentstore.views.import_export.import_handler. An archive member can therefore escape into a sibling course staging directory whose name shares the attacker's base64 directory prefix, causing limited cross-tenant file corruption. Zip archives are not practically affected because ZipFile.extractall strips parent traversal segments, and the advisory does not establish arbitrary filesystem writes, file reads, or direct code execution. This issue is fixed in Ulmo and Verawood.1.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 18, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit

commit e552907ff33a (openedx/openedx-platform)

Fix landed in openedx/openedx-platform commit e552907ff33a — awaiting tagged release

https://github.com/openedx/openedx-platform/commit/e552907ff33a7b2e53f99b819123c9dacdfc127a
github_commit

commit 97de0586d878 (openedx/openedx-platform)

Fix landed in openedx/openedx-platform commit 97de0586d878 — awaiting tagged release

https://github.com/openedx/openedx-platform/commit/97de0586d878936c9f97c03fdaa20346ee8eac29
github_commit

commit 8422334e2063 (openedx/openedx-platform)

Fix landed in openedx/openedx-platform commit 8422334e2063 — awaiting tagged release

https://github.com/openedx/openedx-platform/commit/8422334e2063015a28b6460a34aa4bb4d8ae1ca8
github Patch Available🟡 PoC Available

Path traversal via prefix-bypass in safe_extractall Path Validation · Advisory · openedx/openedx-platform · GitHub

https://github.com/openedx/openedx-platform/security/advisories/GHSA-6cmm-8875-5pcw

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-05 05:36 UTCEG score recompute
  2. 2026-10-04 23:22 UTCEPSS rescore
  3. 2026-10-04 04:48 UTCEG score recompute
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-03 04:00 UTCEG score recompute
  6. 2026-10-02 17:57 UTCEPSS rescore
  7. 2026-10-02 03:09 UTCEG score recompute
  8. 2026-10-01 19:50 UTCEPSS rescore
  9. 2026-10-01 02:22 UTCEG score recompute
  10. 2026-09-30 15:04 UTCEPSS rescore
  11. 2026-09-30 01:34 UTCEG score recompute
  12. 2026-09-29 00:47 UTCEG score recompute
  13. 2026-09-28 13:52 UTCEPSS rescore
  14. 2026-09-27 23:57 UTCEG score recompute
  15. 2026-09-27 13:48 UTCEPSS rescore
  16. 2026-09-26 23:09 UTCEG score recompute
  17. 2026-09-26 15:59 UTCEPSS rescore
  18. 2026-09-24 19:56 UTCEG score recompute
  19. 2026-09-24 14:04 UTCEPSS rescore
  20. 2026-09-23 19:09 UTCEG score recompute
  21. 2026-09-23 17:54 UTCEPSS rescore
  22. 2026-09-22 18:13 UTCEG score recompute
  23. 2026-09-22 16:01 UTCEPSS rescore
  24. 2026-09-21 21:09 UTCEPSS rescore
  25. 2026-09-21 17:26 UTCEG score recompute
Show 7 more
  1. 2026-09-21 16:26 UTCEG score recompute
  2. 2026-09-20 23:07 UTCEG score recompute
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-19 22:16 UTCEG score recompute
  5. 2026-09-18 21:28 UTCEG score recompute
  6. 2026-09-18 20:34 UTCEG score recompute
  7. 2026-09-18 20:34 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-85272?
CVE-2026-85272 is a medium vulnerability published on September 18, 2026. Open edX Platform enables the authoring and delivery of online learning at any scale. From Aspen.1 until Ulmo and Verawood.1, openedx/core/lib/extractarchive.py uses isbadpath to validate safeextractall targets by comparing resolved path strings with startswith instead of comparing path components.…
When was CVE-2026-85272 disclosed?
CVE-2026-85272 was first published on September 18, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85272 actively exploited?
CVE-2026-85272 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-85272?
CVE-2026-85272 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-85272?
A fix for CVE-2026-85272 is available: update to the fixed version the vendor names in its advisory.

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