---
title: "CVE-2018-5135\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-2018-5135?format=md
keywords: index, follow
---

# CVE-2018-5135

Publication date 14 March 2018

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2018-5135?format=md#impact-score)

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## Description

WebExtensions can bypass normal restrictions in some circumstances and use
"browser.tabs.executeScript" to inject scripts into contexts where this
should not be allowed, such as pages from other WebExtensions or
unprivileged "about:" pages. This vulnerability affects Firefox < 59.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 18.04 LTS bionic | Fixed 59.0.1+build1-0ubuntu1 |
| 17.10 artful | Fixed 59.0+build5-0ubuntu0.17.10.1 |
| 16.04 LTS xenial | Fixed 59.0+build5-0ubuntu0.16.04.1 |
| 14.04 LTS trusty | Fixed 59.0+build5-0ubuntu0.14.04.1 |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | High |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5135)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-5135)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-5135)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-5135)

### Related Ubuntu Security Notices (USN)

+ [USN-3596-1](https://usn.ubuntu.com/USN-3596-1)
+ Firefox vulnerabilities
+ 14 March 2018

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2018-06/>
* <https://www.cve.org/CVERecord?id=CVE-2018-5135>