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Vulnerability · Published Aug 6, 2026 · Assigned by fedora

CVE-2026-18487Epiphany: address bar / host spoofing via userinfo in ephy_uri_get_decoded_host()

Medium 5.4

In plain English

A medium-severity security flaw in Epiphany from GNOME. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.3%top 72.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in Epiphany. An issue in how the browser reads web addresses allows attackers to fake the domain name shown in the address bar. If a user clicks a specially crafted link containing a colon (for example, [https://trusted.com:80@attacker.com/](https://trusted.com:80@attacker.com/)), the address bar and security menus will display the safe website (trusted.com) but it will actually load the attacker website (attacker.com) on the screen. This allows attackers to create convincing phishing pages to trick users into trusting a malicious site.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12epiphany-browserno fix listedDEBIAN-CVE-2026-18487
Debian:13epiphany-browserno fix listedDEBIAN-CVE-2026-18487
Debian:14epiphany-browser51~rc-1DEBIAN-CVE-2026-18487
Ubuntu:22.04:LTSepiphany-browserno fix listedUBUNTU-CVE-2026-18487
Ubuntu:24.04:LTSepiphany-browserno fix listedUBUNTU-CVE-2026-18487
Ubuntu:26.04:LTSepiphany-browserno fix listedUBUNTU-CVE-2026-18487
Ubuntu:26.10epiphany-browserno fix listedUBUNTU-CVE-2026-18487

Affected products (as reported)

VendorProductVersions
GNOME Epiphany 49.2 – before *

Weakness: CWE-451 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References