CVE-2013-4523: n/a vulnerability

CVE-2013-4523: Cross-site scripting (XSS) vulnerability in message/lib.php in Moodle through 2.2.11, 2.3.x before 2.3.10,...

Cross-site scripting (XSS) vulnerability in message/lib.php in Moodle through 2.2.11, 2.3.x before 2.3.10, 2.4.x before 2.4.7, and 2.5.x before 2.5.3 allows remote authenticated users to inject arbitrary web script or HTML via a crafted message.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 16:45 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2013-4523 is an authenticated cross-site scripting issue in Moodle messaging. A logged-in user could send a crafted message containing script or HTML that may run in another user’s browser. The main business concern is account/session exposure or unauthorized actions inside affected Moodle environments. Exposure is limited to Moodle deployments running the listed vulnerable versions, especially sites where untrusted or broad user populations can authenticate and use messaging features. Treat this as a required hygiene fix for legacy Moodle systems, not an emergency based on current evidence. Prioritize if the site has many semi-trusted users. Mitigation focus: Upgrade Moodle to a fixed or later supported release for the affected branch.; Review Moodle MDL-41941 and the Moodle security notification for branch-specific guidance.; Prioritize sites with open registration, large student populations, or external user access..

Prepared: Jun 14, 2026, 15:13 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2013-4523 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 26, 2013, 02:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://moodle.org/mod/forum/discuss.php?d=244480CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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