CVE-2023-36473 CSP nonce reuse vulnerability in Discourse
A CSP nonce reuse flaw in Discourse allows XSS attacks to bypass Content Security Policy protections if an XSS vector is discovered.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-36473?
CVE-2023-36473 is a medium-severity cross-site scripting vulnerability in Discourse Discourse, published on 13 Jul 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Discourse is an open source discussion platform. A CSP (Content Security Policy) nonce reuse vulnerability could allow XSS attacks to bypass CSP protection. There are no known XSS vectors at the moment, but should one be discovered, this vulnerability would allow the XSS attack to completely bypass CSP. The vulnerability is patched in the latest tests-passed, beta and stable branches.
Weakness: CWE-79
Which versions are affected by CVE-2023-36473?
1 open source package ship an affected version, including discourse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | All versions | 3.0.5 |
Products include Discourse Discourse.
How do I fix CVE-2023-36473?
Upgrade discourse to 3.0.5 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-2023-36473 being exploited?
There is no known exploitation of CVE-2023-36473 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-2023-36473, GHSA-9f52-624j-8ppq.