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CVE-2026-53636— Open edX LTI OAuth Replay Attack

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 Platform是Open edX组织开源的一个在线课程创建与学习管理平台。 Open edX Platform 3a5ac85之前版本存在授权问题漏洞，该漏洞源于LTI Provider实现中的validate_timestamp_and_nonce函数未验证OAuth nonces或timestamps，导致攻击者可以无限次重放有效的LTI启动请求。

CVSS 4.7 · Medium EPSS 0.28% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
openedx openedx-platform < 3a5ac856c79557c5c74d8b3e6578f289d7cceecd affected
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I. Basic Information for CVE-2026-53636

Vulnerability Information
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Vulnerability Title
Open edX LTI OAuth Replay Attack
Source: CVE Program / CVE List V5
Vulnerability Description
Open edX Platform enables the authoring and delivery of online learning at any scale. Prior to commit 3a5ac85, a security vulnerability has been identified in the Open edX LMS platform's LTI (Learning Tools Interoperability) Provider implementation. The validate_timestamp_and_nonce function in lms/djangoapps/lti_provider/signature_validator.py does not validate OAuth nonces or timestamps, allowing an attacker who captures a valid LTI launch request to replay it an unlimited number of times without detection. This issue has been patched via commit 3a5ac85.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Open edX Platform 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open edX Platform是Open edX组织开源的一个在线课程创建与学习管理平台。 Open edX Platform 3a5ac85之前版本存在授权问题漏洞，该漏洞源于LTI Provider实现中的validate_timestamp_and_nonce函数未验证OAuth nonces或timestamps，导致攻击者可以无限次重放有效的LTI启动请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openedx openedx-platform < 3a5ac856c79557c5c74d8b3e6578f289d7cceecd -

II. Public POCs for CVE-2026-53636

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III. Intelligence Information for CVE-2026-53636

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Patches & Fixes for CVE-2026-53636 (3)

Vendor Advisories for CVE-2026-53636 (1)

Same Patch Batch · openedx · 2026-09-02 · 3 CVEs total

CVE-2026-53635 7.6 HIGH Open edX Platform: Insufficient Permission on set_course_mode_price()
CVE-2026-55421 6.8 MEDIUM Open edX Platform: SSRF in Studio Video Download Endpoint

IV. Related Vulnerabilities

Same product: openedx-platform
Same vendor: openedx
Same weakness: CWE-294