CVE-2018-13796 Moderate severity vulnerability that affects mailman

Medium 6.5 Published 12 Jul 2018 Updated 5 Aug 2024

Attackers can inject arbitrary text into web pages via crafted URLs, potentially misleading users on trusted Mailman sites.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2018-13796?

CVE-2018-13796 is a medium-severity cross-site scripting vulnerability in n/a, published on 12 Jul 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

An issue was discovered in GNU Mailman before 2.1.28. A crafted URL can cause arbitrary text to be displayed on a web page from a trusted site.

Weakness: CWE-20

Which versions are affected by CVE-2018-13796?

3 open source packages ship an affected version, including mailman. It affects 1 product.

Package	Affected	Fixed in
`mailman` PyPI	All versions	`2.1.28`
`mailman` PyPI	All versions	`2.1.28`
`mailman` PyPI	All versions	`2.1.28`

Products include Gnu Mailman.

How do I fix CVE-2018-13796?

Upgrade mailman to 2.1.28 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2018-13796 being exploited?

There is no known exploitation of CVE-2018-13796 in the wild and no public exploit code.

Sources

Also known as GHSA-xqvg-xm9m-p2c4, MGASA-2018-0383, PYSEC-2026-661, UBUNTU-CVE-2018-13796.