CVE-2026-85272 json
Open edX Platform: Path traversal via prefix-bypass in safe_extractall Path Validation
published 2026-09-18 51 d ago modified 2026-09-24 45 d ago also EUVD-2026-83399
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 41%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- github.com/openedx/openedx-platform@8422334 commit
- github.com/openedx/openedx-platform@97de058 commit
- github.com/openedx/openedx-platform@e552907 commit
- github.com/openedx/openedx-platform/releases/tag/release/ulmo.4 release
- github.com/openedx/openedx-platform/releases/tag/release/verawood.1 release
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 48 d ago
Exploit prediction
0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected products
- openedx openedx-platform
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
- github.com /openedx/openedx-platform/commit/8422334e2063015a28b6460a34aa4bb4d8ae1ca8
- github.com /openedx/openedx-platform/commit/97de0586d878936c9f97c03fdaa20346ee8eac29
- github.com /openedx/openedx-platform/commit/e552907ff33a7b2e53f99b819123c9dacdfc127a
- github.com /openedx/openedx-platform/security/advisories/GHSA-6cmm-8875-5pcw
- github.com /openedx/openedx-platform/releases/tag/release/ulmo.4
- github.com /openedx/openedx-platform/releases/tag/release/verawood.1
Sources
- CVE List CVE-2026-85272
- NVD CVE-2026-85272
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.