XSS in Discourse
CVE-2025-48062
Discourse is an open-source discussion platform. Prior to version 3.4.4 of the `stable` branch, version 3.5.0.beta5 of the `beta` branch, and version 3.5.0.beta6-dev of the `tests-passed` branch, certain invites via email may result in HTML injection in the email body if the topic title includes HTML. This includes inviting someone (without an account) to a PM and inviting someone (without an account) to a topic with a custom message. This issue is patched in version 3.4.4 of the `stable` branch, version 3.5.0.beta5 of the `beta` branch, and version 3.5.0.beta6-dev of the `tests-passed` branch. This can be worked around if the relevant templates are overridden without `{topic_title}`.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (12.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Discourse — versions < 3.5.0.beta5, < 3.4.4, 3.5.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-48062?
- CVE-2025-48062 is a high-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2025-06-09.
- How severe is CVE-2025-48062?
- High severity. CVSS v3 base score is 7.1 out of 10.
- Is CVE-2025-48062 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.