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Fencer Vulns
medium 6.1

CVE-2026-6735 json

XSS within PHP-FPM status endpoint

published 2026-05-07 6 mo ago modified 2026-09-08 2 mo ago also BIT-libphp-2026-6735 , BIT-php-2026-6735 , BIT-php-min-2026-6735 , EUVD-2026-28967 , GHSA-7qg2-v9fj-4mwv

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, 8.5.* before 8.5.6, due to improper sanitation of user data, it allows an attacker to compose an URL, which will cause the target to execute arbitrary JavaScript code (XSS) on the target's machine when the target is viewing the PHP-FPM status page.

Patch / fix

  • bitnami libphp 8.2.31, 8.3.31, 8.4.21, 8.5.6
  • bitnami php 8.2.31, 8.3.31, 8.4.21, 8.5.6
  • bitnami php-min 8.2.31, 8.3.31, 8.4.21, 8.5.6
  • PHP Group PHP 8.2.31, 8.3.31, 8.4.21, 8.5.6
  • php8.2 Debian 12 8.2.31-1~deb12u1
  • php8.4 Debian 13 8.4.21-1~deb13u1
  • php8.4 Debian 14 8.4.21-1

debian advisories DEBIAN-CVE-2026-6735

  • php8.1 Ubuntu 22.04 LTS 8.1.2-1ubuntu2.24
  • php8.3 Ubuntu 24.04 LTS 8.3.6-0ubuntu0.24.04.9
  • php8.4 Ubuntu 25.10 8.4.11-1ubuntu1.2
  • php8.5 Ubuntu 26.04 LTS 8.5.4-0ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-6735

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • php RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • libzip RHEL 8 1.6.1-1.module+el8.10.0+22485+a3539972
  • php-gd RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-cli RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-dba RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-dbg RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-ffi RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e
  • php-fpm RHEL 8 7.4.33-4.module+el8.10.0+24352+91532d3e

red hat advisories RHSA-2026:34354RHSA-2026:33449RHSA-2026:23388RHSA-2026:22649RHSA-2026:22305RHSA-2026:22143

  • php8 openSUSE Tumbleweed 8.5.6-1.1

opensuse advisories openSUSE-SU-2026:10747-1

  • php AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0
  • libzip AlmaLinux 8 1.6.1-1.module_el8.6.0+3239+bedf0508
  • libzip AlmaLinux 8 1.6.1-1.module_el8.6.0+2750+78feabcb
  • libzip AlmaLinux 8 1.6.1-1.module_el8.10.0+3935+28808425
  • php-gd AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0
  • php-cli AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0
  • php-dba AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0
  • php-dbg AlmaLinux 8 7.4.33-4.module_el8.10.0+4209+2ed16ff0

almalinux advisories ALSA-2026:34354ALSA-2026:33449ALSA-2026:23388ALSA-2026:22649ALSA-2026:22142ALSA-2026:22143

  • php Rocky Linux 9 8.0.30-6.el9_8
  • libzip Rocky Linux 8 1.6.1-1.module+el8.10.0+1604+6558efc7
  • libzip Rocky Linux 8 1.6.1-1.module+el8.10.0+1912+72767185
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.10.0+1604+6558efc7
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.10.0+1605+02e07af7
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.10.0+1912+72767185
  • php-pecl-rrd Rocky Linux 8 2.0.1-1.module+el8.4.0+414+2e7afcdd
  • php-pecl-rrd Rocky Linux 8 2.0.1-1.module+el8.10.0+1912+72767185

rocky linux advisories RLSA-2026:33449RLSA-2026:34354RLSA-2026:23388RLSA-2026:22649RLSA-2026:22305RLSA-2026:22142

  • php81 Alpine 3.19 8.1.34-r0
  • php82 Alpine 3.22 8.2.31-r0
  • php83 Alpine 3.22 8.3.36-r0
  • php83 Alpine 3.24, Alpine 3.23 8.3.31-r0
  • php84 Alpine 3.22 8.4.27-r0
  • php84 Alpine 3.24, Alpine 3.23 8.4.21-r0
  • php85 Alpine 3.24, Alpine 3.23 8.5.6-r0

alpine advisories ALPINE-CVE-2026-6735

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • php Azure Linux 3.0 8.3.31-1

azure linux advisories AZL-86352

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-6735 updated cvss 5.4

PHP: PHP-FPM: PHP-FPM: Cross-Site Scripting vulnerability via improper URL sanitation

  • Red Hat Enterprise Linux 6 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +20 more Red Hat Enterprise Linux 7 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +18 more Red Hat OpenShift AI (RHOAI) rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9 Red Hat OpenShift Dev Spaces devspaces/code-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) php 7.4.33-4.module+el8.10.0+24352+91532d3e, php 8.2.31-1.module+el8.10.0+24323+abc2b0db, libzip 1.6.1-1.module+el8.10.0+22485+a3539972, libzip 1.7.3-1.module+el8.10.0+20770+a5eca186, php-gd 7.4.33-4.module+el8.10.0+24352+91532d3e, php-gd 8.2.31-1.module+el8.10.0+24323+abc2b0db, +60 more
    fixed: vendor fix RHSA-2026:34354
  • Red Hat Enterprise Linux AppStream (v. 9) php 8.0.30-6.el9_8, php-gd 8.0.30-6.el9_8, php-cli 8.0.30-6.el9_8, php-dba 8.0.30-6.el9_8, php-dbg 8.0.30-6.el9_8, php-ffi 8.0.30-6.el9_8, +77 more
    fixed: vendor fix RHSA-2026:22142
  • Red Hat Enterprise Linux AppStream (v. 10) php 8.3.31-1.el10_2, php-gd 8.3.31-1.el10_2, php8.4 8.4.21-1.el10_2, php-cli 8.3.31-1.el10_2, php-dba 8.3.31-1.el10_2, php-dbg 8.3.31-1.el10_2, +42 more
    fixed: vendor fix RHSA-2026:23388
  • Red Hat Hardened Images php 8.5.6-1.hum1, php-gd 8.5.6-1.hum1, php-cli 8.5.6-1.hum1, php-dba 8.5.6-1.hum1, php-dbg 8.5.6-1.hum1, php-ffi 8.5.6-1.hum1, +21 more
    fixed: vendor fix RHSA-2026:14125

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/php/php-src/security/advisories/GHSA-7qg2-v9fj-4mwv referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 7.3 CVSS: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/S:P/AU:Y/RE:L/U:Amber
CNA 4.0 7.3 CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:X/V:X/RE:L/U:Amber
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami libphp
>=8.2.0, <8.2.31
>=8.3.0, <8.3.31
>=8.4.0, <8.4.21
>=8.5.0, <8.5.6
8.2.31
8.3.31
8.4.21
8.5.6
bitnami php
>=8.2.0, <8.2.31
>=8.3.0, <8.3.31
>=8.4.0, <8.4.21
>=8.5.0, <8.5.6
8.2.31
8.3.31
8.4.21
8.5.6
bitnami php-min
>=8.2.0, <8.2.31
>=8.3.0, <8.3.31
>=8.4.0, <8.4.21
>=8.5.0, <8.5.6
8.2.31
8.3.31
8.4.21
8.5.6

Affected products

  • PHP Group PHP

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of php/php-src published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.