What is CVE-2023-30538?

CVE-2023-30538 is a medium-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-04-18.

How severe is CVE-2023-30538?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Discourse

CVE-2023-30538

Discourse is an open source platform for community discussion. Due to the improper sanitization of SVG files, an attacker can execute arbitrary JavaScript on the users’ browsers by uploading a crafted SVG file. This issue is patched in the latest stable and tests-passed versions of Discourse. Users are advised to upgrade. For users unable to upgrade there are two possible workarounds: enable CDN handing of uploads (and ensure the CDN sanitizes SVG files) or disable SVG file uploads by ensuring that the `authorized extensions` site setting does not include `svg` (or reset that setting to the default, by default Discourse doesn't enable SVG uploads by users).

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (29.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Discourse — versions 3.1.0, beta: < 3.1.0.beta4, stable: < 3.0.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2023-30538?: CVE-2023-30538 is a medium-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-04-18.
How severe is CVE-2023-30538?: Medium severity. CVSS v3 base score is 5.4 out of 10.