HOMEVULNERABILITIESCVE-2023-28333
CRITICAL

CVE-2023-28333

CWE-94Published: March 23, 2023· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

The Mustache pix helper contained a potential Mustache injection risk if combined with user input (note: This did not appear to be implemented/exploitable anywhere in the core Moodle LMS).

NVD Source

Technical Analysis

CVE-2023-28333 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Fedora1 product(s)
fedora
moodle1 product(s)
moodle
Source: NVD CPE · 7 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://moodle.org/mod/forum/discuss.php?d=445065
PATCHhttps://moodle.org/mod/forum/discuss.php?d=445065

All References (6)

→
https://bugzilla.redhat.com/show_bug.cgi?id=2179422
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QZN34VSF4HTCW3C3ZP2OZYSLYUKADPF/
→
https://moodle.org/mod/forum/discuss.php?d=445065Patch · Vendor Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2179422
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QZN34VSF4HTCW3C3ZP2OZYSLYUKADPF/
→
https://moodle.org/mod/forum/discuss.php?d=445065Patch · Vendor Advisory

Quick Facts

CVE IDCVE-2023-28333
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-94
CISA KEVNo
Affected2 vendor(s)
PublishedMar 23, 2023

Related CVEs (CWE-94)

CVE-2026-27597
10.0
CVE-2026-43997
10.0
CVE-2026-61447
10.0
CVE-2025-34077
10.0
CVE-2026-26954
10.0
CVE-2026-44006
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-28333 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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