What is CVE-2020-15516?

CVE-2020-15516 is a medium-severity vulnerability in Mm Forum Project, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-07-07.

How severe is CVE-2020-15516?

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

XSS in Mm Forum Project

CVE-2020-15516

The mm_forum extension through 1.9.5 for TYPO3 allows XSS that can be exploited via CSRF.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-07-07 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.004 (28.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.2% 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

Mm Forum Project

Weakness classification (CWE)

References

typo3.org/help/security-advisories (Third Party Advisory)
typo3.org/security/advisory/typo3-ext-sa-2020-013 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-15516?: CVE-2020-15516 is a medium-severity vulnerability in Mm Forum Project, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-07-07.
How severe is CVE-2020-15516?: Medium severity. CVSS v3 base score is 5.4 out of 10.