An attack can use a blob URL and script to spoof an arbitrary addressbar URL prefaced by "blob:" as the protocol, leading to user confusion…

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-14519

cvss: 5.3; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 12.3%; EPSS 12.3% chance of exploitation in 30 days, percentile 96%
public exploits: 1; Exploit-DB

An attack can use a blob URL and script to spoof an arbitrary addressbar URL prefaced by "blob:" as the protocol, leading to user confusion and further spoofing attacks. This vulnerability affects Firefox < 52.

Patch / fix

fixed in 1 distros 3 links 1

Mozilla Firefox 52

ubuntu opensuse arch linux

firefox Ubuntu 14.04 LTS 52.0+build2-0ubuntu0.14.04.1
firefox Ubuntu 16.04 LTS 52.0+build2-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2017-5415

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 92.0-1.2

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10600-1

firefox Arch Linux 52.0-1

arch linux advisories AVG-194

bugzilla.mozilla.org/show_bug.cgi?id=1321719 patch

Timeline

2017-04-14 First public exploit (EDB-44266)
2018-06-11 Published

Exploit prediction

12.34% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

EDB-44266 Mozilla Firefox - Address Bar Spoofing local, 2017-04-14
bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1321719 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

Mozilla Firefox

Classification

Weakness

CWE-20 Improper Input Validation

References

bugzilla.mozilla.org /show_bug.cgi?id=1321719
exploit, issue-tracking, patch
mozilla.org /security/advisories/mfsa2017-05/
vendor-advisory
securitytracker.com /id/1037966
vdb-entry, third-party-advisory
securityfocus.com /bid/96692
vdb-entry, third-party-advisory

Sources

CVE List CVE-2017-5415
NVD CVE-2017-5415

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary