CVE-2026-54064

HIGHPre-NVD 8.78.7
EchelonGraph scoreLOW confidence

This high-severity CVE scores 8.7 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 8.7Exploit: NoneExposed: 0

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

NukeViet: Multiple Anti-XSS Filter Bypasses Leading to Stored XSS in News Module

Summary

Two filter-bypass techniques in NukeViet\Core\Request::filterAttr() and NukeViet\Core\Request::unhtmlentities() allow a low-privileged user (any account with news post permission) to store and serve arbitrary JavaScript to any visitor of the affected page.

Affected Component

vendor/vinades/nukeviet/Core/Request.php — class NukeViet\Core\Request

Vulnerability Details

Bypass 1 — Form Feed character prefix (\x0C) before event handler name

The filterAttr() method blocks event-handler attributes using: 

preg_match('/^on/i', $attrSubSet[0])
PHP's trim() does not strip the ASCII Form Feed character (\x0C, U+000C). An attacker can prefix the attribute name with \x0C so that \x0Conerror does not match /^on/. The HTML5 browser parser treats \x0C as a valid whitespace separator and correctly activates the event handler.

Proof-of-concept payload (URL-encoded POST body field bodyhtml):

Bypass 2 — Decimal HTML entity tab ( ) inside javascript: URI

unhtmlentities() strips the hex-encoded tab via str_ireplace, but did not strip its decimal equivalent . The keyword-blocking regex /j\s*a\s*v\s*a\s*s\s*c\s*r\s*i\s*p\s*t/si uses \s* which does not match HTML entities. The value jav ascript:alert() passes the filter, is stored in the database, and is decoded by the browser into a working javascript: URI.

Proof-of-concept payload (inside a Markdown-style link): 

Click me)

Impact

An authenticated attacker with news-posting permission can inject persistent JavaScript that executes in the browser of any user (including administrators) who views the affected article. This enables session cookie theft, credential harvesting, defacement, and further privilege escalation.

Patches

Fixed in commit ` by modifying vendor/vinades/nukeviet/Core/Request.php:

  • filterAttr() — strip all ASCII control characters (\x00–\x20) from the attribute name before the /^on/ check:
$attrSubSet[0] = preg_replace('/[\x00-\x20]/', '', strtolower($attrSubSet[0]));
  • unhtmlentities()` — strip decimal HTML entities for all ASCII control characters (0–31) before the keyword checks:
$value = preg_replace('/&#0*(?:3[01]|[12][0-9]|[0-9]);/', '', $value);

Workarounds

None. Update to the patched version.

Resources

  • CWE-79: Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)
  • OWASP WSTG-INPV-02: Testing for Stored Cross Site Scripting
  • OWASP Top 10 A03:2021 – Injection

CVSS v3
8.7
EG Score
8.7(low)
EPSS
—
KEV
Not listed

Published

July 13, 2026

Last Modified

July 13, 2026

Vendor Advisories for CVE-2026-54064(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 5× 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. 2026-07-15 22:09 UTCEG score recompute
  2. 2026-07-15 09:08 UTCEG score recompute
  3. 2026-07-14 20:07 UTCEG score recompute
  4. 2026-07-14 07:08 UTCEG score recompute
  5. 2026-07-13 18:07 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-54064?
CVE-2026-54064 is a high vulnerability published on July 13, 2026. NukeViet: Multiple Anti-XSS Filter Bypasses Leading to Stored XSS in News Module Summary Two filter-bypass techniques in NukeViet\Core\Request::filterAttr() and NukeViet\Core\Request::unhtmlentities() allow a low-privileged user (any account with news post permission) to store and serve arbitrary…
When was CVE-2026-54064 disclosed?
CVE-2026-54064 was first published in the National Vulnerability Database on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-54064?
CVE-2026-54064 has a CVSS v4.0 base score of 8.7 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-54064?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54064, 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.

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