CVE-2018-6506: Cross-Site Scripting (XSS) exists in the Add Forum feature in the Administrative Panel in miniBB 3.2.2 via cra

Routine

MEDIUM 4.8DOWNGRADE

CVE-2018-6506 is a medium-severity flaw (CVSS 4.8) affecting minibb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-Site Scripting (XSS) exists in the Add Forum feature in the Administrative Panel in miniBB 3.2.2 via crafted use of an onload attribute of an SVG element in the supertitle field.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-02-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: minibb

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

Am I affected?

Timeline

2018-02-12 04:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

minibb minibb DOWNGRADE

Affected: 3.2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.2

1. Check installed version

apt-cache policy minibb || rpm -q minibb || minibb --version

2. No fixed release: DOWNGRADE to a release before 3.2.2 (Debian / Ubuntu)

apt-cache madison minibb sudo apt install minibb=<VERSION_BEFORE_3.2.2> sudo apt-mark hold minibb

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list minibb sudo dnf downgrade minibb-<VERSION_BEFORE_3.2.2> sudo dnf versionlock add minibb

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2018-6506?

minibb: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-6506 being exploited?

CVE-2018-6506 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-2018-6506 affect?

CVE-2018-6506 affects minibb. Severity is medium (CVSS 4.8). Cross-Site Scripting (XSS) exists in the Add Forum feature in the Administrative Panel in miniBB 3.2.2 via crafted use of an onload attribute of an SVG element in the supertitle field.

How urgent is CVE-2018-6506?

Priority 33/100. Public exploit reference

References

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