CVE-2026-18487

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-08-07. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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:[email protected]/), 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.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 7, 2026

Advisory Details (4)

Auto-updated Aug 6, 2026
Patch available. Sources: redhat.
generic

(CVE-2026-18487) Address Bar / Host Spoofing via userinfo in ephy_uri_get_decoded_host (#2897) · Issues · GNOME / Epiphany · GitLab

https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2897
generic

Client Challenge

https://gitlab.gnome.org/GNOME/epiphany/-/commit/0dde1d369458ac5c44b74b5ad3c433f825f6f8af
redhat

2509570 – (CVE-2026-18487) CVE-2026-18487 epiphany: address bar / host spoofing via userinfo in ephy_uri_get_decoded_host()

https://bugzilla.redhat.com/show_bug.cgi?id=2509570
redhat Patch Available

CVE-2026-18487 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-18487

Vendor Advisories for CVE-2026-18487(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
epiphany-browser3.38.2-1 ... 50.4-2 (75 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
epiphany-browser43.1-1 ... 50.4-2 (44 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
epiphany-browser48.3-2 ... 50.4-2 (14 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
epiphany-browser48.3-2 ... 50.4-2 (13 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 15:20 UTCEG score recompute
  3. 2026-08-20 15:20 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 15:34 UTCGHSA enrichment
  6. 2026-08-18 15:42 UTCEG score recompute
  7. 2026-08-18 15:42 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 14:23 UTCEG score recompute
  10. 2026-08-17 14:23 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 14:37 UTCEG score recompute
  14. 2026-08-16 14:37 UTCGHSA enrichment
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 14:51 UTCEG score recompute
  17. 2026-08-15 14:51 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 15:04 UTCEG score recompute
  20. 2026-08-14 15:04 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 15:18 UTCGHSA enrichment
  23. 2026-08-12 15:27 UTCEG score recompute
  24. 2026-08-12 15:27 UTCGHSA enrichment
  25. 2026-08-12 13:50 UTCEPSS rescore
Show 16 more
  1. 2026-08-11 15:40 UTCEG score recompute
  2. 2026-08-11 15:40 UTCGHSA enrichment
  3. 2026-08-11 13:42 UTCEPSS rescore
  4. 2026-08-11 00:00 UTCEPSS rescore
  5. 2026-08-10 15:54 UTCGHSA enrichment
  6. 2026-08-09 15:55 UTCEG score recompute
  7. 2026-08-09 15:55 UTCGHSA enrichment
  8. 2026-08-09 13:46 UTCEPSS rescore
  9. 2026-08-08 16:09 UTCEG score recompute
  10. 2026-08-08 16:09 UTCGHSA enrichment
  11. 2026-08-07 16:22 UTCEG score recompute
  12. 2026-08-07 16:22 UTCGHSA enrichment
  13. 2026-08-07 16:03 UTCEG score recompute
  14. 2026-08-07 16:03 UTCGHSA enrichment
  15. 2026-08-06 22:18 UTCEG score recompute
  16. 2026-08-06 22:15 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18487?
CVE-2026-18487 is a medium vulnerability published on August 6, 2026. 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:[email protected]/), the address bar and security menus will…
When was CVE-2026-18487 disclosed?
CVE-2026-18487 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18487 actively exploited?
CVE-2026-18487 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 75.3% of all scored CVEs.
What is the CVSS score of CVE-2026-18487?
CVE-2026-18487 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-18487?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18487, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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