What is CVE-2023-22455?

CVE-2023-22455 is a medium-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2023-01-05.

How severe is CVE-2023-22455?

Medium severity. CVSS v3 base score is 6.8 out of 10.

XSS in Discourse

CVE-2023-22455

Discourse is an option source discussion platform. Prior to version 2.8.14 on the `stable` branch and version 3.0.0.beta16 on the `beta` and `tests-passed` branches, tag descriptions, which can be updated by moderators, can be used for cross-site scripting attacks. This vulnerability can lead to a full XSS on sites which have modified or disabled Discourse’s default Content Security Policy. Versions 2.8.14 and 3.0.0.beta16 contain a patch.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.005 (38.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

Affected products

Discourse — versions 2.4.0, 2.9.0, 2.8.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2023-22455?: CVE-2023-22455 is a medium-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2023-01-05.
How severe is CVE-2023-22455?: Medium severity. CVSS v3 base score is 6.8 out of 10.