What is CVE-2023-28467?

CVE-2023-28467 is a medium-severity vulnerability in Mybb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-05-22.

How severe is CVE-2023-28467?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2023-28467 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Mybb

CVE-2023-28467

In MyBB before 1.8.34, there is XSS in the User CP module via the user email field.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-05-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (41.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Mybb

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

mybb.com (Product)
github.com/mybb/mybb/security/advisories/GHSA-3q8x-9fh2-v646 (Patch, Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2023-28467?: CVE-2023-28467 is a medium-severity vulnerability in Mybb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-05-22.
How severe is CVE-2023-28467?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2023-28467 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.