CVE-2019-13644 Firefly III vulnerable to stored XSS

Medium 5.4 Published 18 Jul 2019 Updated 4 Aug 2024

Stored XSS in Firefly III allows attackers with similar access rights to execute JavaScript via budget names, potentially leading to session hijacking.

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

What is CVE-2019-13644?

CVE-2019-13644 is a medium-severity cross-site scripting vulnerability in n/a, published on 18 Jul 2019. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Firefly III before 4.7.17.1 is vulnerable to stored XSS due to lack of filtration of user-supplied data in a budget name. The JavaScript code is contained in a transaction, and is executed on the tags/show/$tag_number$ tag summary page. NOTE: It is asserted that an attacker must have the same access rights as the user in order to be able to execute the vulnerability

Weakness: CWE-79

Which versions are affected by CVE-2019-13644?

2 open source packages ship an affected version, including grumpydictator/firefly-iii. It affects 1 product.

Package	Affected	Fixed in
`grumpydictator/firefly-iii` Packagist	All versions	`4.7.17.1`
`grumpydictator/firefly-iii` Packagist	All versions	`4.7.17.1`

Products include Firefly-Iii Firefly Iii.

How do I fix CVE-2019-13644?

Upgrade grumpydictator/firefly-iii to 4.7.17.1 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-2019-13644 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-13644 exists.

Sources

Also known as GHSA-9xmx-rj7j-fv9q.