EUVD-2026-54082
GHSA-c486-5fvq-fp3v
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attacker-supplied HTML passively redirects victims (UI:R, S:C) with no server-side impact; only downstream navigation integrity is affected (I:L), and no authentication is required to submit the payload.
Primary rating from Vendor (EEF).
CVSS VectorVendor: EEF
Lifecycle Timeline
2DescriptionCVE.org
URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to force visitors of a page to navigate to a site of the attacker's choosing via a <meta http-equiv="refresh"> element in sanitized HTML. HtmlSanitizeEx.html5/1 keeps attacker-supplied <meta> elements in its output. A meta element acts on the whole document rather than on the fragment it was embedded in, so it can also declare document-wide directives such as Content-Security-Policy.
This is not cross-site scripting. Browsers do not navigate a meta refresh to a javascript: URL, so the uppercase JAVASCRIPT: filter bypass yields no script execution and none was demonstrated.
This issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.
AnalysisAI
Open redirect in html_sanitize_ex (Elixir, versions 0.3.1 through 1.5.2) allows remote attackers to force page visitors to navigate to attacker-controlled URLs by injecting <meta http-equiv="refresh"> elements that the HTML5 scrubber (HtmlSanitizeEx.Scrubber.HTML5) passes through intact into sanitized output. Because a meta refresh acts at document scope rather than fragment scope, it overrides the host page's navigation regardless of where the sanitized fragment is embedded. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The application must be using html_sanitize_ex's HtmlSanitizeEx.Scrubber.HTML5 scrubber specifically - not the Basic or Generic scrubbers, which are not implicated. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 2.3 accurately reflects the narrow real-world impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade html_sanitize_ex to version 1.5.3 or later; the fix is delivered via commit 9f7e38be51edc38f132dfe994f37af5cf5e0e76f (https://github.com/rrrene/html_sanitize_ex/commit/9f7e38be51edc38f132dfe994f37af5cf5e0e76f). … Detailed patch versions, workarounds, and compensating controls in full report. |
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