CVE-2018-11715: The Recent Threads plugin before 1.1 for MyBB allows XSS via a thread subject.

Q: How do I fix CVE-2018-11715?

recent threads: upgrade to 1.1. Exact commands for each OS are on this page.

Q: Is CVE-2018-11715 being exploited?

CVE-2018-11715 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-2018-11715 affect?

CVE-2018-11715 affects recent threads. Severity is medium (CVSS 5.4). The Recent Threads plugin before 1.1 for MyBB allows XSS via a thread subject.

Q: How urgent is CVE-2018-11715?

Priority 43/100. Public exploit reference

This month

MEDIUM 5.4UPGRADE

CVE-2018-11715 is a medium-severity flaw (CVSS 5.4) affecting recent threads. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Recent Threads plugin before 1.1 for MyBB allows XSS via a thread subject.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-06-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: recent threads project

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

Am I affected?

Timeline

2018-06-04 17:29 UTCPublished CVE record published
2026-06-17 01:36 UTCUpdated Record last modified

recent threads project recent threads UPGRADE

Affected: < 1.1

Fixed in: 1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy recent-threads || rpm -q recent-threads || recent-threads --version

2. UPGRADE to 1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade recent-threads

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade recent-threads

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: MyBB Recent Threads Plugin 1.0 - Cross-Site Scripting

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-2018-11715?

recent threads: upgrade to 1.1. Exact commands for each OS are on this page.

Is CVE-2018-11715 being exploited?

CVE-2018-11715 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-2018-11715 affect?

CVE-2018-11715 affects recent threads. Severity is medium (CVSS 5.4). The Recent Threads plugin before 1.1 for MyBB allows XSS via a thread subject.

How urgent is CVE-2018-11715?

Priority 43/100. Public exploit reference

References

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