HOMEVULNERABILITIESCVE-2018-5116
CRITICAL

CVE-2018-5116

CWE-346Published: June 11, 2018· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

WebExtensions with the "ActiveTab" permission are able to access frames hosted within the active tab even if the frames are cross-origin. Malicious extensions can inject frames from arbitrary origins into the loaded page and then interact with them, bypassing same-origin user expectations with this permission. This vulnerability affects Firefox < 58.

NVD Source

Technical Analysis

CVE-2018-5116 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Canonical1 product(s)
ubuntu linux
Mozilla1 product(s)
firefox
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://www.securityfocus.com/bid/102786
ADVISORYhttp://www.securitytracker.com/id/1040270
ADVISORYhttps://usn.ubuntu.com/3544-1/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2018-02/
ADVISORYhttp://www.securityfocus.com/bid/102786
ADVISORYhttp://www.securitytracker.com/id/1040270
ADVISORYhttps://usn.ubuntu.com/3544-1/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2018-02/

All References (10)

→
http://www.securityfocus.com/bid/102786Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1040270Third Party Advisory · VDB Entry
→
https://bugzilla.mozilla.org/show_bug.cgi?id=1396399Issue Tracking · Permissions Required
→
https://usn.ubuntu.com/3544-1/Third Party Advisory
→
https://www.mozilla.org/security/advisories/mfsa2018-02/Vendor Advisory
→
http://www.securityfocus.com/bid/102786Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1040270Third Party Advisory · VDB Entry
→
https://bugzilla.mozilla.org/show_bug.cgi?id=1396399Issue Tracking · Permissions Required
→
https://usn.ubuntu.com/3544-1/Third Party Advisory
→
https://www.mozilla.org/security/advisories/mfsa2018-02/Vendor Advisory

Quick Facts

CVE IDCVE-2018-5116
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-346
CISA KEVNo
Affected2 vendor(s)
PublishedJun 11, 2018

Related CVEs (CWE-346)

CVE-2026-42901
10.0
CVE-2023-30856
10.0
CVE-2020-26527
9.8
CVE-2017-13274
9.8
CVE-2022-3457
9.8
CVE-2018-15723
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-5116 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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