CVE-2020-15516: The mm_forum extension through 1.9.5 for TYPO3 allows XSS that can be exploited via CSRF.

Q: How do I fix CVE-2020-15516?

mm forum: upgrade to newer than 1.9.5. Exact commands for each OS are on this page.

Q: Is CVE-2020-15516 being exploited?

CVE-2020-15516 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-15516 affect?

CVE-2020-15516 affects mm forum. Severity is medium (CVSS 5.4). The mm_forum extension through 1.9.5 for TYPO3 allows XSS that can be exploited via CSRF.

Q: How urgent is CVE-2020-15516?

Priority 27/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2020-15516 is a medium-severity flaw (CVSS 5.4) affecting mm forum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-79, CWE-352
Published	2020-07-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mm forum project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-07-07 14:15 UTCPublished CVE record published
2026-06-17 02:56 UTCUpdated Record last modified

mm forum project mm forum UPGRADE

Affected: <= 1.9.5

Fixed in: newer than 1.9.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mm-forum || rpm -q mm-forum || mm-forum --version

2. UPGRADE to newer than 1.9.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mm-forum

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mm-forum

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-15516?

mm forum: upgrade to newer than 1.9.5. Exact commands for each OS are on this page.

Is CVE-2020-15516 being exploited?

CVE-2020-15516 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-15516 affect?

CVE-2020-15516 affects mm forum. Severity is medium (CVSS 5.4). The mm_forum extension through 1.9.5 for TYPO3 allows XSS that can be exploited via CSRF.

How urgent is CVE-2020-15516?

Priority 27/100. No elevated risk signals yet.

Software pages

TYPO3 vulnerabilities

References

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