CVE-2026-57671Public exploitNetwork attack vector

Browser script execution via undisclosed request handling

Published Jul 2, 2026 · Updated Jul 2, 2026

Reflected XSS in forgemedia LLC Perfmatters 2.6.4 and earlier allows remote attackers to inject scripts through unauthenticated requests. Patchstack has not disclosed the affected request parameter, handler, or exact output-encoding failure that reflects untrusted input. Successful exploitation requires a privileged user to perform an attacker-influenced action, after which script execution occurs in the victim's browser and can alter displayed content or access page data.

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 2.6.4 and earlier allows remote attackers to inject scripts through unauthenticated requests. Patchstack has not disclosed the affected request parameter, handler, or exact output-encoding failure that reflects untrusted input. Successful exploitation requires a privileged user to perform an attacker-influenced action, after which script execution occurs in the victim's browser and can alter displayed content or access page data.

The record

CVE
CVE-2026-57671
Published
Jul 2, 2026
Updated
Jul 2, 2026
Vendor
forgemedia LLC
Product
Perfmatters
Classifications
CWE-79, CAPEC-591, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 2, 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 <=2.6.4 changes=[{"at":"2.6.5","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

forgemedia LLC · Perfmattersversion=n/a <=2.6.4 changes=[{"at":"2.6.5","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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-591Reflected XSS
T1190Exploit Public-Facing Application

Public exploit references

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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