CVE-2023-43657 Improper escaping of encrypted topic titles can lead to Cross-site Scripting under non-default site configuration
Attackers can execute arbitrary scripts via encrypted topic titles if CSP is disabled, requiring plugin upgrade or CSP enablement.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-43657?
CVE-2023-43657 is a high-severity cross-site scripting vulnerability in discourse-encrypt, published on 28 Sep 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
discourse-encrypt is a plugin that provides a secure communication channel through Discourse. Improper escaping of encrypted topic titles could lead to a cross site scripting (XSS) issue when a site has content security policy (CSP) headers disabled. Having CSP disabled is a non-default configuration, and having it disabled with discourse-encrypt installed will result in a warning in the Discourse admin dashboard. This has been fixed in commit `9c75810af9` which is included in the latest version of the discourse-encrypt plugin. Users are advised to upgrade. Users unable to upgrade should ensure that CSP headers are enabled and properly configured.
Weakness: CWE-79
Which versions are affected by CVE-2023-43657?
It affects 1 product.
Products include Discourse Discourse-Encrypt.
How do I fix CVE-2023-43657?
No fix has been published for CVE-2023-43657 yet. Limit exposure of the affected software until one is available.
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-2023-43657 being exploited?
There is no known exploitation of CVE-2023-43657 in the wild and no public exploit code.
Sources
Also known as GHSA-5fh6-wp7p-xx7v.