What is CVE-2017-16780?

CVE-2017-16780 is a critical-severity vulnerability in Mybb, classified under Cross-Site Request Forgery (CSRF). CVSS score: 9.8/10. Published 2017-11-10.

How severe is CVE-2017-16780?

Critical severity. CVSS v3 base score is 9.8 out of 10.

CSRF in Mybb

CVE-2017-16780

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

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2017-11-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.058 (92.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.058 · newest: 0.058 · change: 0.000

Affected products

Mybb

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

blog.mybb.com/2017/11/07/mybb-1-8-13-released-security-maintenance-release/ (Release Notes, Vendor Advisory)
www.exploit-db.com/exploits/43136/ (Exploit, VDB Entry, Third Party Advisory, exploit)

Frequently asked questions

What is CVE-2017-16780?: CVE-2017-16780 is a critical-severity vulnerability in Mybb, classified under Cross-Site Request Forgery (CSRF). CVSS score: 9.8/10. Published 2017-11-10.
How severe is CVE-2017-16780?: Critical severity. CVSS v3 base score is 9.8 out of 10.