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TI-2023-09440 Aliases CVE-2023-23611GHSA-7j9p-67mm-5g87

xblock-lti-consumer contain Missing Authorization in Grade Pass Back Implementation

Priority LOW 25CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

LTI Consumer XBlock implements the consumer side of the LTI specification enabling integration of third-party LTI provider tools. Versions 7.0.0 and above, prior to 7.2.2, are vulnerable to Missing Authorization. Any LTI tool that is integrated with on the Open edX platform can post a grade back for any LTI XBlock so long as it knows or can guess the block location for that XBlock. An LTI tool submits scores to the edX platform for line items. The code that uploads that score to the LMS grade tables determines which XBlock to upload the grades for by reading the resource_link_id field of the associated line item. The LTI tool may submit any value for the resource_link_id field, allowing a malicious LTI tool to submit scores for any LTI XBlock on the platform. The impact is a loss of integrity for LTI XBlock grades. This issue is patched in 7.2.2. No workarounds exist.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00394 33rd percentileScored 2026-11-07
Fix Fixed xblock-lti-consumer (openedx): 7.2.2lti-consumer-xblock (PyPI): 7.2.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
openedxxblock-lti-consumer7.0.0 to before 7.2.27.2.2Patch availableCNA
—lti-consumer-xblock (PyPI)7.0.0 to before 7.2.27.2.2Patch availableGHSA-7j9p-67mm-5g87
  • xblock-lti-consumer Vendoropenedx Affected 7.0.0 to before 7.2.2 Fixed in 7.2.2 Patch available CNA
  • lti-consumer-xblock (PyPI) Vendor— Affected 7.0.0 to before 7.2.2 Fixed in 7.2.2 Patch available GHSA-7j9p-67mm-5g87

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openedx:xblock-lti-consumer:*:*:*:*:*:*:*:*7.0.0 to before 7.2.2Vulnerableopenedx
  • cpe:2.3:a:openedx:xblock-lti-consumer:*:*:*:*:*:*:*:* Versions 7.0.0 to before 7.2.2 Vulnerable ·openedx

Remediation

  • Fix · CNA xblock-lti-consumer (openedx) Fixed in 7.2.2
  • Fix · GHSA-7j9p-67mm-5g87 lti-consumer-xblock (PyPI) Fixed in 7.2.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-23611
  2. 2026-10-03 Alias added: GHSA-7j9p-67mm-5g87

References

Advisory 2

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences