How severe is CVE-2017-16780?

CVE-2017-16780 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-16780 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16780?

CVE-2017-16780 affects Mybb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-16780?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-16780 published?

CVE-2017-16780 was published on 2017-11-10 and last updated on 2026-06-17.

CVE-2017-16780

CVE-2017-16780 is a critical-severity vulnerability in Mybb with a CVSS 3.x base score of 9.8. 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-352.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Mybb
Published: 2017-11-10
Last modified: 2026-06-17

Description

The installer in MyBB before 1.8.13 allows remote attackers to execute arbitrary code by writing to the configuration file.

Frequently asked questions

What is CVE-2017-16780?: The installer in MyBB before 1.8.13 allows remote attackers to execute arbitrary code by writing to the configuration file.
How severe is CVE-2017-16780?: CVE-2017-16780 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-16780 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16780?: CVE-2017-16780 affects Mybb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-16780?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-16780 published?: CVE-2017-16780 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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