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Fencer Vulns
medium 4.3

CVE-2021-40691 json

Moodle Improper Authentication

published 2022-01-21 4 y ago modified 2026-09-08 2 mo ago also BIT-moodle-2021-40691 , EUVD-2022-6748 , GHSA-92vh-mr2w-j2cr

cvss
4.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

A session hijack risk was identified in the Shibboleth authentication plugin.

Patch / fix

  • packagist moodle/moodle 3.9.10, 3.10.7, 3.11.3
  • bitnami moodle 3.9.10, 3.10.7, 3.11.3
  • moodle moodle 3.9.10, 3.10.7, 3.11.3

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-2021-40691 updated cvss 6.5

moodle: Session Hijack risk when Shibboleth authentication is enabled

  • 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

0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
OSV 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
packagist moodle/moodle
>=3.9, <3.9.10
>=3.10, <3.10.7
>=3.11, <3.11.3
3.9.10
3.10.7
3.11.3
bitnami moodle
<3.9.10
>=3.10.0, <3.10.7
>=3.11.0, <3.11.3
3.9.10
3.10.7
3.11.3

Affected products

  • n/a moodle

References

Sources

Fencer Vulns 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.