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Ubuntu Security Notice USN-7502-1
May 07, 2025

php-horde-css-parser vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Horde Css Parser could be made to crash or run programs as your login if
it opened a specially crafted file.

Software Description:
- php-horde-css-parser: ${phppear:summary}

Details:

It was discovered that Horde Css Parser did not correctly handle
parsing uncontrolled CSS data. An attacker could possibly use
this issue to perform remote code execution. (CVE-2020-13756)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS
  php-horde-css-parser            1.0.11-1ubuntu1+esm1
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  php-horde-css-parser            1.0.8-1ubuntu1+esm1
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7502-1 
<https://ubuntu.com/security/notices/USN-7502-1>
  CVE-2020-13756