CVE-2023-26040 Discourse chat messages susceptible to Cross-site Scripting through chat excerpts
Attackers can execute arbitrary scripts in victim browsers by sending malicious chat messages, potentially leading to session hijacking or data theft.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-26040?
CVE-2023-26040 is a medium-severity cross-site scripting vulnerability in Discourse Discourse, published on 17 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Discourse is an open-source discussion platform. Between versions 3.1.0.beta2 and 3.1.0.beta3 of the `tests-passed` branch, editing or responding to a chat message containing malicious content could lead to a cross-site scripting attack. This issue is patched in version 3.1.0.beta3 of the `tests-passed` branch. There are no known workarounds.
Weakness: CWE-79
Which versions are affected by CVE-2023-26040?
1 open source package ship an affected version, including discourse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | From 3.1.0-beta2 to 3.1.0-beta2 | None |
Products include Discourse Discourse.
How do I fix CVE-2023-26040?
No fix has been published for CVE-2023-26040 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-2023-26040 being exploited?
There is no known exploitation of CVE-2023-26040 in the wild and no public exploit code.
Other vulnerabilities in Discourse Discourse
- CVE-2021-41163 RCE via malicious SNS subscription payload
- CVE-2022-36066 Discourse vulnerable to RCE via admins uploading maliciously zipped file
- CVE-2022-39356 Discourse user account takeover via email and invite link
- CVE-2023-22468 Discourse vulnerable to Cross-site Scripting in local oneboxes
- CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint
Sources
Also known as BIT-discourse-2023-26040, GHSA-ccfc-qpmp-gq87.