CVE-2020-36173Network attack vector

Stored XSS via unescaped submissions-table field output

Published Jan 6, 2021 · Updated Aug 4, 2024

Stored XSS in the submissions table in Ninja Forms before 3.4.28 allows remote attackers to inject script through crafted form fields. The submissions-table renderer outputs stored field values without context-appropriate escaping, causing HTML or script content to be interpreted by the browser. A site must retain the crafted submission and render it in the WordPress submissions view; the script then runs in the viewer's browser context.

CVSS severity5.3
Medium
EPSS probability1.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the submissions table in Ninja Forms before 3.4.28 allows remote attackers to inject script through crafted form fields. The submissions-table renderer outputs stored field values without context-appropriate escaping, causing HTML or script content to be interpreted by the browser. A site must retain the crafted submission and render it in the WordPress submissions view; the script then runs in the viewer's browser context.

The record

CVE
CVE-2020-36173
Published
Jan 6, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-116, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5Wordfence IntelligenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
5.3NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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