How severe is CVE-2017-16781?

CVE-2017-16781 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2017-16781 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16781?

CVE-2017-16781 affects Mybb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-16781?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-16781 published?

CVE-2017-16781 was published on 2017-11-10 and last updated on 2026-06-17.

CVE-2017-16781

CVE-2017-16781 is a medium-severity vulnerability in Mybb with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mybb
Published: 2017-11-10
Last modified: 2026-06-17

Description

The installer in MyBB before 1.8.13 has XSS.

Frequently asked questions

What is CVE-2017-16781?: The installer in MyBB before 1.8.13 has XSS.
How severe is CVE-2017-16781?: CVE-2017-16781 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2017-16781 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16781?: CVE-2017-16781 affects Mybb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-16781?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-16781 published?: CVE-2017-16781 was published on 2017-11-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*

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