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CVE-2025-3839

Epiphany: insecure external protocol invocation in epiphany

8.0 HighFix available

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

0.39%Up 0.4 points since Jan 23, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.0

Epiphany: insecure external protocol invocation in epiphany

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Record
CVE-2025-3839
CVSS 3.1
8.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Weakness
CWE-356
Updated
2026-11-02
EUVDEUVD-2026-4436 8.0

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Record
EUVD-2026-4436
CVSS 3.1
8.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-h95f-v923-pcr4 8.0

A flaw was found in Epiphany, a tool that allows websites to open external URL handler...

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Record
GHSA-h95f-v923-pcr4
CVSS 3.1
8.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Weakness
CWE-356
Updated
2026-11-02
NVD 8.0

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Record
CVE-2025-3839
CVSS 3.1
8.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Weakness
CWE-356
Updated
2026-11-02
OSV 8.0

Epiphany: insecure external protocol invocation in epiphany

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Record
CVE-2025-3839
CVSS 3.1
8.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Weakness
CWE-356
Updated
2026-11-02
OSVDEBIAN-CVE-2025-3839 8.0

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Record
DEBIAN-CVE-2025-3839
CVSS 3.1
8.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2025-3839 8.0

A flaw was found in Epiphany, a tool that allows websites to open external URL handler applications with minimal user interaction. This design can be misused to exploit vulnerabilities within those handlers, making them appear remotely exploitable. The browser fails to properly warn or gate this action, resulting in potential code execution on the client device via trusted UI behavior.

Record
UBUNTU-CVE-2025-3839
CVSS 3.1
8.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Updated
2026-11-02
OSVopenSUSE-SU-2025:15011-1 No score

epiphany-48.1-1.1 on GA media

These are all security issues fixed in the epiphany-48.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:15011-1
Updated
2026-11-02

Affected packages

Affected packages
PackageAffectedFixed
epiphany-browser
Debian:12
All versions, plus listed versions
43.1-144.0-144.1-144.2-144.3-1
Show 40 moreShow less
44.5-144.5-244.6-144~rc-145.0-145.1-145.2-145~beta-146.0-146.0-246.1-146.2-146.3-146~alpha-146~beta-147.0-147.2-147~beta-147~rc-148.0-148.1-148.2-148.3-148.3-248.5-148.5-248.5-348~beta-148~rc-148~rc-249.0-149.1-149.2-149.2-249.2-350.3-150.3-250.4-150.4-251~rc-1
None known
epiphany-browser
Debian:13
before 48.1-1
48.1-1
epiphany-browser
Debian:14
before 48.1-1
48.1-1
epiphany-browser
Ubuntu:16.04:LTS
All versions, plus listed versions
3.16.3-1ubuntu13.18.0-1ubuntu23.18.1-1ubuntu13.18.3-0ubuntu13.18.5-0ubuntu13.18.5-0ubuntu1.13.18.10-0ubuntu13.18.11-0ubuntu1
None known
epiphany-browser
Ubuntu:18.04:LTS
All versions, plus listed versions
3.26.1-1ubuntu13.26.1-1ubuntu23.26.1-1ubuntu43.26.5.1-1ubuntu13.27.90-1ubuntu1
Show 4 moreShow less
3.28.0.1-1ubuntu13.28.1-1ubuntu13.28.5-0ubuntu13.28.6-0ubuntu1
None known
epiphany-browser
Ubuntu:20.04:LTS
All versions, plus listed versions
3.34.1-13.34.1-1build13.36.0-13.36.1-13.36.2-0ubuntu13.36.3-0ubuntu13.36.4-0ubuntu13.36.4-0ubuntu2
None known
epiphany-browser
Ubuntu:22.04:LTS
All versions, plus listed versions
41.0-141.0-241.2-141.3-142~beta-1
Show 4 moreShow less
42.0-142.1-142.1-1ubuntu142.4-0ubuntu1
None known
epiphany-browser
Ubuntu:24.04:LTS
All versions, plus listed versions
45.0-145.1-146~alpha-146~beta-146.0-146.0-2build146.5-0ubuntu1
None known
epiphany-browser
Ubuntu:25.10
All versions, plus listed versions
48.0-148.3-148.3-248.3-2build148.5-148.5-3
None known
epiphany
openSUSE:Tumbleweed
before 48.1-1.1
48.1-1.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-3839 is a high vulnerability (CVSS 8.0) in epiphany, published April 22, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.39%, the 33rd percentile. Fixed in epiphany-browser 48.1-1.

References

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