CVE-2021-36869Network attack vector

Reflected XSS via unsanitized post parameter

Published Oct 21, 2021 · Updated Apr 28, 2026

Cross-site scripting in Ivory Search 4.6.6 and earlier allows remote attackers to execute script in a victim browser via the &post parameter. The plugin reflects attacker-controlled post input into generated web content without adequate neutralization, creating a reflected XSS response. Exploitation requires a victim to follow a crafted link and interact with the affected WordPress site; script runs with the site's browser context and can read or alter accessible page data.

CVSS severity6.1
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Ivory Search 4.6.6 and earlier allows remote attackers to execute script in a victim browser via the &post parameter. The plugin reflects attacker-controlled post input into generated web content without adequate neutralization, creating a reflected XSS response. Exploitation requires a victim to follow a crafted link and interact with the affected WordPress site; script runs with the site's browser context and can read or alter accessible page data.

The record

CVE
CVE-2021-36869
Published
Oct 21, 2021
Updated
Apr 28, 2026
Vendor
Ivory Search
Product
Ivory Search
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 4.6.6 <=4.6.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ivory Search · Ivory Searchversion=<= 4.6.6 <=4.6.6

Published CVSS scores

4.8PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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