CVE-2018-25248: MyBB Downloads Plugin 2.0.3 contains a persistent cross-site scripting vulnerability that allows regular membe

This week

HIGH 7.2REMOTEDOWNGRADE

CVE-2018-25248 is a high-severity flaw (CVSS 7.2) affecting mybb downloads. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MyBB Downloads Plugin 2.0.3 contains a persistent cross-site scripting vulnerability that allows regular members to inject malicious scripts through the download title field. Attackers can submit a new download with HTML/JavaScript code in the title parameter, which executes when administrators validate the download in downloads.php.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-04
Last modified	2026-07-20

Publisher (CNA): VulnCheck · Vendor: mybb

Last updated 2026-07-20 · 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
2026-07-20 20:10 UTCUpdated Record last modified

mybb mybb downloads DOWNGRADE

Affected: 2.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.3

1. Check installed version

apt-cache policy mybb-downloads || rpm -q mybb-downloads || mybb-downloads --version

2. No fixed release: DOWNGRADE to a release before 2.0.3 (Debian / Ubuntu)

apt-cache madison mybb-downloads sudo apt install mybb-downloads=<VERSION_BEFORE_2.0.3> sudo apt-mark hold mybb-downloads

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

dnf --showduplicates list mybb-downloads sudo dnf downgrade mybb-downloads-<VERSION_BEFORE_2.0.3> sudo dnf versionlock add mybb-downloads

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-2018-25248?

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

Is CVE-2018-25248 being exploited?

CVE-2018-25248 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-2018-25248 affect?

CVE-2018-25248 affects mybb downloads. Severity is high (CVSS 7.2). MyBB Downloads Plugin 2.0.3 contains a persistent cross-site scripting vulnerability that allows regular members to inject malicious scripts through the download title field. Attackers can submit a new download with HTML/JavaScript code in

How urgent is CVE-2018-25248?

Priority 38/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

References

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