CVE-2026-46392

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 87% of all CVEs by exploit prediction. 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: epss, secondary
Elevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: Elevated riskExposed: 0

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

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0 of HAX CMS PHP, the saveFile endpoint validates upload extensions case-insensitively and writes the filename to disk verbatim, but the .htaccess rule that forces Content-Disposition: attachment on HTML files is case-sensitive. An HTML file uploaded with an uppercase extension (.HTML, .Html, .HTM) is still served as text/html but the forced-download header never applies, so the browser renders it inline and executes any embedded JavaScript in the HAXcms origin. This bypasses the mitigation shipped for CVE-2026-22704. Version 26.0.0 contains a fix.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
55(Track*)
EG Risk 55/100SSVC: 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
Severity87% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

June 5, 2026

Last Modified

June 5, 2026

Advisory Details (1)

Auto-updated Jun 5, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Stored XSS via Case-Sensitivity Mismatch in HTML Upload Validation · Advisory · haxtheweb/issues · GitHub

https://github.com/haxtheweb/issues/security/advisories/GHSA-hg33-w4j2-95qp

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 31× 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.

Showing the most recent 100 of 133 total refreshes for this CVE.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 05:00 UTCEG score recompute
  3. 2026-09-13 16:47 UTCEPSS rescore
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  1. 2026-08-20 22:55 UTCEPSS rescore
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  26. 2026-08-06 13:47 UTCEPSS rescore
  27. 2026-08-05 20:19 UTCEG score recompute
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  39. 2026-07-30 16:28 UTCEPSS rescore
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  74. 2026-06-29 14:06 UTCEPSS rescore
  75. 2026-06-29 14:06 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-46392?
CVE-2026-46392 is a high vulnerability published on June 5, 2026. HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0 of HAX CMS PHP, the saveFile endpoint validates upload extensions case-insensitively and writes the filename to disk verbatim, but the .htaccess rule that forces Content-Disposition: attachment on HTML…
When was CVE-2026-46392 disclosed?
CVE-2026-46392 was first published in the National Vulnerability Database on June 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46392 actively exploited?
CVE-2026-46392 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 87.0% of all scored CVEs.
What is the CVSS score of CVE-2026-46392?
CVE-2026-46392 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-46392?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46392, 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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