What is CVE-2022-43708?

CVE-2022-43708 is a medium-severity vulnerability in Mybb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-11-22.

How severe is CVE-2022-43708?

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

XSS in Mybb

CVE-2022-43708

MyBB 1.8.31 has a (issue 2 of 2) cross-site scripting (XSS) vulnerabilities in the post Attachments interface allow attackers to inject HTML by persuading the user to upload a file with specially crafted name

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-11-22 · 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: 0.004 (30.4th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Mybb

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

mybb.com (Product)
github.com/mybb/mybb/security/advisories/GHSA-p9m7-9qv4-x93w (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-43708?: CVE-2022-43708 is a medium-severity vulnerability in Mybb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-11-22.
How severe is CVE-2022-43708?: Medium severity. CVSS v3 base score is 6.1 out of 10.