Answer in brief
CVE-2023-23611 records a Low severity (CVSS 3.7) vulnerability in LTI 1.3 Grade Pass Back Implementation has Missing Authorization Vulnerability. The current sources do not mark it as known exploited. The current feed maps lti-consumer-xblock (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 3.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps lti-consumer-xblock (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| lti-consumer-xblockpypi | >=7.0.0 <7.2.2 | 7.2.2 |
Published upstream
Aug 30, 2024
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 10, 2026
### Problem TL;DR: 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. In LTI 1.3, LTI tools can "pass back" scores that learners earn while using LTI tools to the edX platform. The edX platform then stores those LTI scores in a separate table. If the right conditions are met, these scores are then persisted to the LMS grades tables. LTI tools can create what are called "line items" on the edX platform. A line item can be thought of as a column in a grade book; it stores results for a specific activity (i.e. XBlock) for a specific set of users (i.e. users in the course using the XBlock). A line item has an optional resource_link_id field, which is basically the XBlock location. An LTI tool can supply any value for this field. 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. Because the LTI tool could have submitted any value for the resource_link_id field, this introduces the potential for a nefarious LTI tool to submit scores for any LTI XBlock on the platform. ### Impact 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 the resource_link_id (i.e. block location) for that XBlock. The impact is a loss of integrity for LTI XBlock grades. ### Patches No available patch ### Workarounds No
Quoted source text, attributed separately from HOL analysis.