CVE-2026-56047Network attack vector

Unauthenticated reflected XSS via unsanitized PMCS output

Published Jun 26, 2026 · Updated Jun 26, 2026

Reflected XSS in forgemedia LLC Perfmatters 2.6.3 and earlier allows remote attackers to execute script in a privileged user's browser. The vendor attributes the flaw to PMCS admin output sanitization and query handling across snippet editor and list views, but the exact parameter and rendering operation remain undisclosed. No authentication is required to craft the request, but execution requires a privileged user to follow a malicious link or visit a crafted page, exposing browser-accessible data and actions in that user's session.

CVSS severity7.1
High
EPSS probability0.25%
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 forgemedia LLC Perfmatters 2.6.3 and earlier allows remote attackers to execute script in a privileged user's browser. The vendor attributes the flaw to PMCS admin output sanitization and query handling across snippet editor and list views, but the exact parameter and rendering operation remain undisclosed. No authentication is required to craft the request, but execution requires a privileged user to follow a malicious link or visit a crafted page, exposing browser-accessible data and actions in that user's session.

The record

CVE
CVE-2026-56047
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
forgemedia LLC
Product
Perfmatters
Classifications
CWE-79, CAPEC-591, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 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 <=2.6.3 changes=[{"at":"2.6.4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

forgemedia LLC · Perfmattersversion=n/a <=2.6.3 changes=[{"at":"2.6.4","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
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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