CVE-2018-25250: MyBB Last User's Threads in Profile Plugin 1.2 contains a persistent cross-site scripting vulnerability that a

Q: How do I fix CVE-2018-25250?

last user threads: upgrade to newer than 1.2. Exact commands for each OS are on this page.

Q: Is CVE-2018-25250 being exploited?

CVE-2018-25250 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-2018-25250 affect?

CVE-2018-25250 affects last user threads. Severity is high (CVSS 7.2). MyBB Last User's Threads in Profile Plugin 1.2 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by crafting thread subjects with script tags. Attackers can create threads with script

Q: How urgent is CVE-2018-25250?

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

This week

HIGH 7.2REMOTEUPGRADE

CVE-2018-25250 is a high-severity flaw (CVSS 7.2) affecting last user threads. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MyBB Last User's Threads in Profile Plugin 1.2 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by crafting thread subjects with script tags. Attackers can create threads with script payloads in the subject field that execute when users visit the attacker's profile page.

Why this priority

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

A fixed release or distro patch exists.

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 90%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-04
Last modified	2026-07-24

Publisher (CNA): VulnCheck · Vendor: mybb

Last updated 2026-07-24 · 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
2026-07-24 22:10 UTCUpdated Record last modified

mybb last user threads UPGRADE

Affected: <= 1.2

Fixed in: newer than 1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy last-user-threads || rpm -q last-user-threads || last-user-threads --version

2. UPGRADE to newer than 1.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade last-user-threads

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade last-user-threads

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-2018-25250?

last user threads: upgrade to newer than 1.2. Exact commands for each OS are on this page.

Is CVE-2018-25250 being exploited?

CVE-2018-25250 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-2018-25250 affect?

CVE-2018-25250 affects last user threads. Severity is high (CVSS 7.2). MyBB Last User's Threads in Profile Plugin 1.2 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by crafting thread subjects with script tags. Attackers can create threads with script

How urgent is CVE-2018-25250?

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

References

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