Moodle Blind SSRF Risk in /badges/mybackpack.php

published 2019-03-25 7 y ago modified 2026-06-17 4 mo ago also GHSA-jp4g-r8c9-3534 , EUVD-2022-4404

cvss: 6.5; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

A flaw was found in Moodle versions 3.1 to 3.1.15 and earlier unsupported versions. The mybackpack functionality allowed setting the URL of badges, when it should be restricted to the Mozilla Open Badges backpack URL. This resulted in the possibility of blind SSRF via requests made by the page.

Patch / fix

fixed in 1 distros 1 links 3

packagist moodle/moodle 3.1.16

moodle Ubuntu Pro 18.04 LTS, Ubuntu Pro 16.04 LTS 3.0.3+dfsg-0ubuntu1+esm1

ubuntu advisories UBUNTU-CVE-2019-3809

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2019-3809 updated 2025-11-21 cvss 6.5

moodle: Blind SSRF Risk in /badges/mybackpack.php (MSA-19-0002)

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

0.84% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	6.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
NVD	3.0	10.0	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.0	10.0	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
packagist	moodle/moodle	>=3.1, <3.1.16	3.1.16

Affected products

[UNKNOWN] moodle

Classification

Weakness

CWE-352 Cross-Site Request Forgery
CWE-918 Server-Side Request Forgery

References

bugzilla.redhat.com /show_bug.cgi?id=CVE-2019-3809
web, issue-tracking, patch, third-party-advisory
moodle.org /mod/forum/discuss.php?d=381229#p1536766
web, patch, vendor-advisory
git.moodle.org /gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-64222
web, patch, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2019-3809
advisory
github.com /moodle/moodle
package

Sources

CVE List CVE-2019-3809
GitHub Advisory GHSA-jp4g-r8c9-3534
NVD CVE-2019-3809

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.

Summary