CVE-2019-13038

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as...

6.1 MediumFix available

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

1.42%Up 0.4 points since Apr 14, 2021

What each source reports

NVD Score used 6.1

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.

Record: CVE-2019-13038
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-601
Updated: 2026-11-02

CVE List No score

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.

Record: CVE-2019-13038
Updated: 2026-11-02

EUVDEUVD-2019-4603 No score

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.

Record: EUVD-2019-4603
Updated: 2026-11-03

GitHub AdvisoriesGHSA-67h8-fxm4-vr72 6.1

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as...

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.

Record: GHSA-67h8-fxm4-vr72
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-601
Updated: 2026-11-02

OSV 6.1

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.

Record: CVE-2019-13038
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2019-13038 6.1

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.

Record: DEBIAN-CVE-2019-13038
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

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OSVRHSA-2020:1003 6.1

Red Hat Security Advisory: mod_auth_mellon security and bug fix update

Record: RHSA-2020:1003
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVRHSA-2020:1660 6.1

Red Hat Security Advisory: mod_auth_mellon security and bug fix update

Record: RHSA-2020:1660
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2019-13038 6.1

mod_auth_mellon through 0.14.2 has an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.

Record: UBUNTU-CVE-2019-13038
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVUSN-4291-1 No score

libapache2-mod-auth-mellon vulnerability

It was discovered that mod_auth_mellon incorrectly handled certain requests. An attacker could possibly use this issue to redirect a user to a malicious URL.

Record: USN-4291-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`libapache2-mod-auth-mellon` Debian:12	before 0.15.0-1	0.15.0-1
`libapache2-mod-auth-mellon` Debian:13	before 0.15.0-1	0.15.0-1
`libapache2-mod-auth-mellon` Debian:14	before 0.15.0-1	0.15.0-1
`libapache2-mod-auth-mellon` Debian:10 From an advisory covering 2 CVEs	before 0.14.2-1+deb10u1, plus listed versions 0.14.2-1	0.14.2-1+deb10u1
`mod_auth_mellon` Red Hat:enterprise_linux:7::server	before 0:0.14.0-8.el7	0:0.14.0-8.el7
`mod_auth_mellon-debuginfo` Red Hat:enterprise_linux:7::server	before 0:0.14.0-8.el7	0:0.14.0-8.el7
`mod_auth_mellon-diagnostics` Red Hat:enterprise_linux:7::server	before 0:0.14.0-8.el7	0:0.14.0-8.el7
`mod_auth_mellon` Red Hat:enterprise_linux:7::workstation	before 0:0.14.0-8.el7	0:0.14.0-8.el7
`mod_auth_mellon-debuginfo` Red Hat:enterprise_linux:7::workstation	before 0:0.14.0-8.el7	0:0.14.0-8.el7
`mod_auth_mellon-diagnostics` Red Hat:enterprise_linux:7::workstation	before 0:0.14.0-8.el7	0:0.14.0-8.el7

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Affected packages
Package	Affected	Fixed
`mod_auth_mellon` Red Hat:enterprise_linux:8::appstream	before 0:0.14.0-11.el8	0:0.14.0-11.el8
`mod_auth_mellon-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:0.14.0-11.el8	0:0.14.0-11.el8
`mod_auth_mellon-debugsource` Red Hat:enterprise_linux:8::appstream	before 0:0.14.0-11.el8	0:0.14.0-11.el8
`mod_auth_mellon-diagnostics` Red Hat:enterprise_linux:8::appstream	before 0:0.14.0-11.el8	0:0.14.0-11.el8
`mod_auth_mellon-diagnostics-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:0.14.0-11.el8	0:0.14.0-11.el8
`libapache2-mod-auth-mellon` Ubuntu:16.04:LTS	All versions, plus listed versions 0.10.0-10.11.0-10.12.0-10.12.0-2+deb9u1build0.16.04.1	None known
`libapache2-mod-auth-mellon` Ubuntu:18.04:LTS	before 0.13.1-1ubuntu0.2, plus listed versions 0.13.1-10.13.1-1build10.13.1-1build20.13.1-1ubuntu0.1	0.13.1-1ubuntu0.2
`libapache2-mod-auth-mellon` Ubuntu:20.04:LTS	before 0.14.2-1ubuntu2, plus listed versions 0.14.2-1ubuntu1	0.14.2-1ubuntu2

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-13038 is a medium vulnerability (CVSS 6.1) in Canonical Ubuntu Linux, published June 29, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.42%, the 73rd percentile. Fixed in libapache2-mod-auth-mellon 0.15.0-1.

References

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