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CVE-2019-13038

22
FAUCET Score

CVE-2019-13038 is an Open Redirect vulnerability affecting mod_auth_mellon through version 0.14.2, as well as products from Canonical, Fedora Project, and Oracle. This flaw allows an attacker to redirect users to arbitrary external sites by manipulating the "login?ReturnTo=" parameter, specifically by omitting the double slash in the target URL. Rated as MEDIUM severity with a CVSS score of 6.1, this vulnerability requires user interaction (UI:R) and can lead to information disclosure (C:L) and integrity loss (I:L), primarily through phishing attacks. The attack complexity is low (AC:L), and it can be exploited over the network (AV:N). Currently, there is no evidence of active exploitation, nor is exploit code publicly available in Metasploit or ExploitDB. The vulnerability has received minimal community attention, with no social media discussion or media coverage reported.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.14.2CPE matchmatch criteria
cpe:2.3:a:mod_auth_mellon_project:mod_auth_mellon:*:*:*:*:*:apache:*:*
8.8CPE matchmatch criteria
cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
30CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
31CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.42%
Probability of exploitation in next 30 days
EPSS Percentile
70.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0142 is in the 82nd percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

oraclepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: mod_auth_mellon-0:0.14.0-8.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mod_auth_mellon-0:0.14.0-11.el8
View patch
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: httpd24-mod_auth_mellon

Vendor Advisories (1)

redhatCVE-2019-13038Moderate

mod_auth_mellon: Open Redirect via the login?ReturnTo= substring which could facilitate information theft

Jun 20, 2019

References

github.com / Uninett/mod_auth_mellon/issues/35
Issue TrackingThird Party Advisory
lists.debian.org / debian-lts-announce/2023/03/msg00010.html
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/A5E3JVHURJJNDP63CKVX5O5MJAGCQV4K
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/XU5GVFZW3C2M4ZBL4F7UP7N24FNUCX4E
usn.ubuntu.com / 4291-1
Third Party Advisory
oracle.com / security-alerts/cpuapr2022.html
PatchThird Party Advisory