CVE-2018-25249: MyBB My Arcade Plugin 1.3 contains a persistent cross-site scripting vulnerability that allows authenticated u

Routine

MEDIUM 6.4DOWNGRADE

CVE-2018-25249 is a medium-severity flaw (CVSS 6.4) affecting my arcade. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MyBB My Arcade Plugin 1.3 contains a persistent cross-site scripting vulnerability that allows authenticated users to inject malicious scripts through arcade game score comments. Attackers can add crafted HTML and JavaScript payloads in the comment field that execute when other users view or edit the comment.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-04
Last modified	2026-07-21

Publisher (CNA): VulnCheck · Vendor: mybb

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-04 14:16 UTCPublished CVE record published
2026-07-21 07:10 UTCUpdated Record last modified

mybb my arcade DOWNGRADE

Affected: 1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3

1. Check installed version

apt-cache policy my-arcade || rpm -q my-arcade || my-arcade --version

2. No fixed release: DOWNGRADE to a release before 1.3 (Debian / Ubuntu)

apt-cache madison my-arcade sudo apt install my-arcade=<VERSION_BEFORE_1.3> sudo apt-mark hold my-arcade

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

dnf --showduplicates list my-arcade sudo dnf downgrade my-arcade-<VERSION_BEFORE_1.3> sudo dnf versionlock add my-arcade

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-2018-25249?

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

Is CVE-2018-25249 being exploited?

CVE-2018-25249 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-2018-25249 affect?

CVE-2018-25249 affects my arcade. Severity is medium (CVSS 6.4). MyBB My Arcade Plugin 1.3 contains a persistent cross-site scripting vulnerability that allows authenticated users to inject malicious scripts through arcade game score comments. Attackers can add crafted HTML and JavaScript payloads in the

How urgent is CVE-2018-25249?

Priority 32/100. Public exploit reference

References

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