What is CVE-2017-7566?

CVE-2017-7566 is a high-severity vulnerability in Mybb, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2017-04-06.

How severe is CVE-2017-7566?

High severity. CVSS v3 base score is 7.7 out of 10.

SSRF in Mybb

CVE-2017-7566

MyBB before 1.8.11 allows remote attackers to bypass an SSRF protection mechanism.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2017-04-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.022 (81.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Mybb

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

www.securityfocus.com/bid/97480 (VDB Entry, Third Party Advisory, vdb-entry)
www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20170407-0_MyBB_… (Exploit, Patch, Third Party Advisory)
github.com/mybb/mybb/commit/f5de8fc2aad11e0d2583f585535ccfa2b46325db (Patch)
blog.mybb.com/2017/04/04/mybb-1-8-11-merge-system-1-8-11-release/ (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2017-7566?: CVE-2017-7566 is a high-severity vulnerability in Mybb, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2017-04-06.
How severe is CVE-2017-7566?: High severity. CVSS v3 base score is 7.7 out of 10.