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Fencer Intel
medium 6.1

CVE-2020-25631 json

Moodle Cross-site Scripting (XSS)

published 5y ago modified 2mo ago also BIT-moodle-2020-25631 , EUVD-2022-2455 , GHSA-4w4j-9533-82qg

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

A vulnerability was found in Moodle 3.9 to 3.9.1, 3.8 to 3.8.4 and 3.7 to 3.7.7 where it was possible to include JavaScript in a book's chapter title, which was not escaped on the "Add new chapter" page. This is fixed in 3.9.2, 3.8.5 and 3.7.8.

Patch / fix

  • packagist moodle/moodle 3.7.8, 3.8.5, 3.9.2
  • bitnami moodle 3.7.8, 3.8.5, 3.9.2
  • moodle moodle 3.7.8, 3.8.5, 3.9.2

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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-2020-25631 updated cvss 6.1

moodle: XSS vulnerability

  • 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

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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
OSV 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
packagist moodle/moodle
>=3.9, <3.9.2
>=3.8, <3.8.5
>=3.7, <3.7.8
3.9.2
3.8.5
3.7.8
bitnami moodle
>=3.7.0, <3.7.8
>=3.8.0, <3.8.5
>=3.9.0, <3.9.2
3.7.8
3.8.5
3.9.2

Affected products

  • n/a 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.