CVE-2026-6735Public exploitNetwork attack vector

Cross-site scripting via unescaped request URI

Published May 10, 2026 · Updated May 10, 2026

Cross-site scripting in PHP-FPM allows remote attackers to execute JavaScript in a status-page viewer's browser via a crafted request URI. The full HTML and XML status renderers include a request URI retained from an earlier attacker request without neutralizing markup. No authentication or direct status-endpoint access is needed to plant the URI, but execution requires another user to open the full status page.

CVSS severity6.1
Medium
EPSS probability0.21%
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 PHP-FPM allows remote attackers to execute JavaScript in a status-page viewer's browser via a crafted request URI. The full HTML and XML status renderers include a request URI retained from an earlier attacker request without neutralizing markup. No authentication or direct status-endpoint access is needed to plant the URI, but execution requires another user to open the full status page.

The record

CVE
CVE-2026-6735
Published
May 10, 2026
Updated
May 10, 2026
Vendor
The PHP Group
Product
PHP
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2026CVE publishedPublication date reported by the CVE source.
  2. May 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=8.2.* <8.2.31
  2. Affected versionversion=8.3.* <8.3.31
  3. Affected versionversion=8.4.* <8.4.21
  4. Affected versionversion=8.5.* <8.5.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The PHP Group · PHPversion=8.2.* <8.2.31; version=8.3.* <8.3.31; version=8.4.* <8.4.21; version=8.5.* <8.5.6

Published CVSS scores

7.3PHP GroupCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:P
6.1NIST NVDCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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