CVE-2018-25116: MyBB Thread Redirect Plugin 0.2.1 contains a cross-site scripting vulnerability in the custom text input field

Routine

MEDIUM 6.1DOWNGRADE

CVE-2018-25116 is a medium-severity flaw (CVSS 6.1) affecting thread redirect. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MyBB Thread Redirect Plugin 0.2.1 contains a cross-site scripting vulnerability in the custom text input field for thread redirects. Attackers can inject malicious SVG scripts that will execute when other users view the thread, allowing arbitrary script execution.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-01-23
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: mybb

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

Am I affected?

Timeline

2026-01-23 17:15 UTCPublished CVE record published
2026-06-17 01:54 UTCUpdated Record last modified

mybb thread redirect DOWNGRADE

Affected: 0.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2.1

1. Check installed version

apt-cache policy thread-redirect || rpm -q thread-redirect || thread-redirect --version

2. No fixed release: DOWNGRADE to a release before 0.2.1 (Debian / Ubuntu)

apt-cache madison thread-redirect sudo apt install thread-redirect=<VERSION_BEFORE_0.2.1> sudo apt-mark hold thread-redirect

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

dnf --showduplicates list thread-redirect sudo dnf downgrade thread-redirect-<VERSION_BEFORE_0.2.1> sudo dnf versionlock add thread-redirect

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-2018-25116?

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

Is CVE-2018-25116 being exploited?

CVE-2018-25116 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-2018-25116 affect?

CVE-2018-25116 affects thread redirect. Severity is medium (CVSS 6.1). MyBB Thread Redirect Plugin 0.2.1 contains a cross-site scripting vulnerability in the custom text input field for thread redirects. Attackers can inject malicious SVG scripts that will execute when other users view the thread, allowing arb

How urgent is CVE-2018-25116?

Priority 32/100. Public exploit reference

References

← Back to latest CVEs