CVE-2016-9421

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.27% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 67.8% of scored records. A rank, not a probability.

NVD base score

6.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2017-01-31 22:00Z9 YR AGO

Last updated

2024-08-06 02:50Z2 YR AGO

Reserved

2016-11-17

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.1

Document digest

fed2dd9664467f376c5162eaac0b58005391c942919bf6356f1b47f57eadf719

• blog.mybb.comhttps://blog.mybb.com/2016/10/17/mybb-1-8-8-merge-system-1-8-8-release/x_refsource_CONFIRM
• www.openwall.com[oss-security] 20161117 Re: CVE request: MyBB multiple vulnerabilitieshttp://www.openwall.com/lists/oss-security/2016/11/18/1mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20161110 CVE request: MyBB multiple vulnerabilitieshttp://www.openwall.com/lists/oss-security/2016/11/10/8mailing-listx_refsource_MLIST
• www.securityfocus.com94396http://www.securityfocus.com/bid/94396vdb-entryx_refsource_BID