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Fencer Intel
medium 4.3

CVE-2019-3810 json

Moodle XSS Vulnerability

published 7y ago modified 4mo ago also GHSA-wm4w-8vc6-2j4h , EUVD-2022-5591

cvss
4.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
13.8%
EPSS 13.8% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

A flaw was found in moodle versions 3.6 to 3.6.1, 3.5 to 3.5.3, 3.4 to 3.4.6, 3.1 to 3.1.15 and earlier unsupported versions. The /userpix/ page did not escape users' full names, which are included as text when hovering over profile images. Note this page is not linked to by default and its access is restricted.

Patch / fix

  • packagist moodle/moodle 3.1.15, 3.4.6, 3.5.3, 3.6.1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-3810 updated cvss 4.3

moodle: User full name is not escaped in the un-linked userpix page (MSA-19-0003)

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-49814)

Exploit prediction

13.84% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-49814 Moodle 3.6.1 - Persistent Cross-Site Scripting (XSS) webapps, 2021-04-30
  • packetstormsecurity.com http://packetstormsecurity.com/files/162399/Moodle-3.6.1-Cross-Site-Scripting.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 4.3 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
packagist moodle/moodle
>=3.6.0, <3.6.1
>=3.5.0, <3.5.3
>=3.4.0, <3.4.6
>=3.1.0, <3.1.15
3.6.1
3.5.3
3.4.6
3.1.15

Affected products

  • [UNKNOWN] moodle

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.