CVE-2022-30596Network attack vector

Stored XSS via unescaped assignment marker IDs

Published May 18, 2022 · Updated Aug 3, 2024

Stored XSS in the assignment grading interface of Moodle LMS allows remote authenticated users to execute script in a marker's browser. The bulk marker allocation form renders stored user ID numbers without sufficient HTML escaping, allowing markup to enter the returned page. An attacker needs a low-privileged account that can supply the ID value, and a marker must open bulk allocation; successful script execution can read or change data accessible to that browser session.

CVSS severity5.4
Medium
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the assignment grading interface of Moodle LMS allows remote authenticated users to execute script in a marker's browser. The bulk marker allocation form renders stored user ID numbers without sufficient HTML escaping, allowing markup to enter the returned page. An attacker needs a low-privileged account that can supply the ID value, and a marker must open bulk allocation; successful script execution can read or change data accessible to that browser session.

The record

CVE
CVE-2022-30596
Published
May 18, 2022
Updated
Aug 3, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=Affects : 4.0, 3.11 to 3.11.6, 3.10 to 3.10.10, 3.9 to 3.9.13 and earlier unsupported versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moodle · Moodle LMSversion=Affects : 4.0, 3.11 to 3.11.6, 3.10 to 3.10.10, 3.9 to 3.9.13 and earlier unsupported versions

Published CVSS scores

3.5NIST National Vulnerability DatabaseAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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