CVE-2026-28187Network attack vector

Unauthenticated browser script execution via reflected XSS

Published Aug 13, 2026 · Updated Aug 13, 2026

Reflected XSS in Echo Knowledge Base 17.211.0 and earlier allows remote attackers to execute script in a victim's browser. Public advisories identify the flaw only as reflected XSS; neither Patchstack nor the vendor changelog names the affected endpoint, parameter, or escaping failure. No authentication is required, but exploitation requires a user to open a crafted link or page; the script runs in the affected site's browser context.

CVSS severity7.1
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Echo Knowledge Base 17.211.0 and earlier allows remote attackers to execute script in a victim's browser. Public advisories identify the flaw only as reflected XSS; neither Patchstack nor the vendor changelog names the affected endpoint, parameter, or escaping failure. No authentication is required, but exploitation requires a user to open a crafted link or page; the script runs in the affected site's browser context.

The record

CVE
CVE-2026-28187
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Echo Plugins
Product
Echo Knowledge Base
Classifications
CWE-79, CAPEC-591, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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=n/a <=17.211.0 changes=[{"at":"17.212.0","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Echo Plugins · Echo Knowledge Baseversion=n/a <=17.211.0 changes=[{"at":"17.212.0","status":"unaffected"}]

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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')
CAPEC-591Reflected XSS
T1059.007JavaScript/JScript

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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