CVE-2023-23611Network attack vector

Grade manipulation via attacker-controlled resource link IDs

Published Jan 25, 2023 · Updated Mar 10, 2025

Missing authorization in Open edX LTI Consumer XBlock 7.0.0 through 7.2.1 allows remote authenticated users to alter LTI grades. Grade pass-back code trusts the line item's attacker-controlled resource_link_id when selecting the XBlock whose score is written to LMS grade tables. Reachability requires an integrated LTI tool and a known or guessable block location, and successful exploitation corrupts grade integrity.

CVSS severity3.7
Low
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Open edX LTI Consumer XBlock 7.0.0 through 7.2.1 allows remote authenticated users to alter LTI grades. Grade pass-back code trusts the line item's attacker-controlled resource_link_id when selecting the XBlock whose score is written to LMS grade tables. Reachability requires an integrated LTI tool and a known or guessable block location, and successful exploitation corrupts grade integrity.

The record

CVE
CVE-2023-23611
Published
Jan 25, 2023
Updated
Mar 10, 2025
Vendor
Open edX
Product
LTI Consumer XBlock
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 7.0.0, < 7.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open edX · LTI Consumer XBlockversion=>= 7.0.0, < 7.2.2

Published CVSS scores

3.7GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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