CVE-2024-52702: A stored cross-site scripting (XSS) vulnerability in the component install\index.php of MyBB v1.8.38 allows at

Routine

MEDIUM 5.4DOWNGRADE

CVE-2024-52702 is a medium-severity flaw (CVSS 5.4) affecting mybb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stored cross-site scripting (XSS) vulnerability in the component install\index.php of MyBB v1.8.38 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the Website Name parameter. NOTE: this is disputed by the Supplier because Website Name can only be set by an administrator, who may use JavaScript if they wish.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-11-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mybb

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

Am I affected?

Timeline

2024-11-20 21:15 UTCPublished CVE record published
2026-06-17 08:07 UTCUpdated Record last modified

mybb mybb DOWNGRADE

Affected: 1.8.38

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.8.38

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.8.38 (Debian / Ubuntu)

apt-cache madison mybb sudo apt install mybb=<VERSION_BEFORE_1.8.38> sudo apt-mark hold mybb

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

dnf --showduplicates list mybb sudo dnf downgrade mybb-<VERSION_BEFORE_1.8.38> sudo dnf versionlock add mybb

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-2024-52702?

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

Is CVE-2024-52702 being exploited?

CVE-2024-52702 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-2024-52702 affect?

CVE-2024-52702 affects mybb. Severity is medium (CVSS 5.4). A stored cross-site scripting (XSS) vulnerability in the component install\index.php of MyBB v1.8.38 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the Website Name parameter. NOTE: this is dis

How urgent is CVE-2024-52702?

Priority 29/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

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CVE-2025-29459 HIGH 7.6 DOWNGRADE An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Mail function
CVE-2025-29458 HIGH 7.6 DOWNGRADE An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Change Avatar functio

References

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