CVE-2023-23922Network attack vector

Browser script execution via unsanitized blog search

Published Feb 17, 2023 · Updated Aug 2, 2024

Reflected XSS in Moodle LMS 4.0.0 through 4.0.5 and 4.1.0 allows remote attackers to execute browser script via a crafted blog search. The blog endpoint accepts the search parameter as raw input and insufficiently sanitizes it before including it in rendered page content. Exploitation requires a victim to follow the crafted link; script then runs in the vulnerable site's browser context and can read or modify page-accessible data.

CVSS severity6.1
Medium
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Moodle LMS 4.0.0 through 4.0.5 and 4.1.0 allows remote attackers to execute browser script via a crafted blog search. The blog endpoint accepts the search parameter as raw input and insufficiently sanitizes it before including it in rendered page content. Exploitation requires a victim to follow the crafted link; script then runs in the vulnerable site's browser context and can read or modify page-accessible data.

The record

CVE
CVE-2023-23922
Published
Feb 17, 2023
Updated
Aug 2, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=4.0.0 <4.0.6
  2. Affected versionversion=4.1.0 <4.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moodle · Moodle LMSversion=4.0.0 <4.0.6; version=4.1.0 <4.1.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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