--- title: "CVE-2026-6735\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2026-6735?format=md keywords: index, follow --- # CVE-2026-6735 Publication date 10 May 2026 Last updated 5 June 2026 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **6.1 · Medium** [Score breakdown](https://ubuntu.com/security/CVE-2026-6735?format=md#impact-score) Toggle side navigation ## Description 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. [Read the notes from the security team](https://ubuntu.com/security/CVE-2026-6735?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | php5 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | 14.04 LTS trusty | Needs evaluation | | php7.0 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | 16.04 LTS xenial | Needs evaluation | | php7.2 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | 18.04 LTS bionic | Needs evaluation | | php7.4 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | 20.04 LTS focal | Needs evaluation | | php8.1 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Fixed 8.1.2-1ubuntu2.24 | | php8.3 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Fixed 8.3.6-0ubuntu0.24.04.9 | | 22.04 LTS jammy | Not in release | | php8.4 | 26.04 LTS resolute | Not in release | | 25.10 questing | Fixed 8.4.11-1ubuntu1.2 | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | php8.5 | 26.04 LTS resolute | Fixed 8.5.4-0ubuntu1.1 | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) * [Patch details](https://ubuntu.com/security/CVE-2026-6735?format=md#patch-details) ## Notes --- ### [sbeattie](https://launchpad.net/~sbeattie) PEAR issues should go against php-pear as of xenial ### Patch details For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) | Package | Patch details | | --- | --- | | php8.5 | * Upstream: [99a5ad7](https://github.com/php/php-src/commit/99a5ad7441de9914246c7863adb6997396008b9d) | ## Severity score breakdown CVSS version: CVSS v4.0 [CVSS v4.0](https://ubuntu.com/security/CVE-2026-6735?format=md) [CVSS v3.0](https://ubuntu.com/security/CVE-2026-6735?format=md) **Base score** 7.3 · High * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Attack requirements | Present | | Privileges required | None | | User interaction | Passive | | Vulnerable system - Confidentiality impact | High | | Vulnerable system - Integrity impact | High | | Vulnerable system - Availability impact | None | | Subsequent system - Confidentiality impact | High | | Subsequent system - Integrity impact | High | | Subsequent system - Availability impact | None | * Scores | Parameter | Value | | --- | --- | | Base score | 7.3 · High | | Base + Threat score | - | | Base + Environmental score | - | | Base + Threat + Environmental score | - | **Vector:** 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 ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-6735) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-6735) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-6735) * [Debian](https://security-tracker.debian.org/tracker/CVE-2026-6735) ### Related Ubuntu Security Notices (USN) + [USN-8336-1](https://usn.ubuntu.com/USN-8336-1) + PHP vulnerabilities + 28 May 2026 ### Other references * *