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CVE-2026-85272— Open edX Platform: Path traversal via prefix-bypass in safe_extractall Path Validation

Quick assessment

Affected
openedx openedx-platform
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open edX 平台支持任意规模下在线学习的创建与交付。 从 Aspen.1 版本起，直至 Ulmo 和 Verawood.1 版本， 中的 函数用于验证 的目标路径，其实现方式是通过比较解析后的路径字符串（使用 ），而非比较路径组件。因此，拥有课程导入权限的课程作者或工作人员用户，可以通过 发起的 流程，提交一个精心构造的 归档文件。这样一来，归档中的文件成员有可能“逃逸”至某个兄弟课程暂存目录——该目录的名称恰好以攻击者的 base64 目录前缀开头，从而导致有限的跨租户文件损坏。 由于 会去除父级路径遍历段

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190.002
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I. Basic Information for CVE-2026-85272

Vulnerability Information
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Vulnerability Title
Open edX Platform: Path traversal via prefix-bypass in safe_extractall Path Validation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
openedx openedx-platform >= release/aspen.1, < release/ulmo.4 -

II. Public POCs for CVE-2026-85272

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III. Intelligence Information for CVE-2026-85272

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Patches & Fixes for CVE-2026-85272 (3)

Other References for CVE-2026-85272 (3)

IV. Related Vulnerabilities

Same product: openedx-platform
Same vendor: openedx
Same weakness: CWE-22

V. Comments for CVE-2026-85272

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