CVE-2026-108109

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-10-09. A secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 9.1Exploit: Elevated riskExposed services: Not assessed

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

PHPNuxBill through 2025.3.20 contains an account takeover vulnerability in the customer password reset flow in system/controllers/forgot.php that allows unauthenticated attackers to brute-force the 6-digit otp_code. Attackers knowing a customer username can guess the code without attempt limits or lockout, then read the newly set password from the HTTP response to hijack the account.

CVSS v3
9.1
EG Score
9.1CRITICALhigh confidence
EG Risk
72
EG Risk 72/100CISA SSVC

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
Severity91% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 9, 2026

Last Modified

October 9, 2026

Advisory Details (5)

Auto-updated Oct 9, 2026
🔬 Proof of concept available. No fix on record yet. Sources: github, github_commit.
generic

PHPNuxBill through 2025.3.20 Account Takeover via Brute-Forceable Password Reset Code | Advisories | VulnCheck

https://www.vulncheck.com/advisories/phpnuxbill-through-2025.3.20-account-takeover-via-brute-forceable-password-reset-code
generic

GitHub - hotspotbilling/phpnuxbill: PHP Mikrotik Billing - Voucher management for Mikrotik Hotspot · GitHub

https://github.com/hotspotbilling/phpnuxbill
generic

phpnuxbill/system/controllers/forgot.php at 2025.3.13 · hotspotbilling/phpnuxbill · GitHub

https://github.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/controllers/forgot.php#L41
github_commit

commit c3c2a92d468a (hotspotbilling/phpnuxbill)

Fix landed in hotspotbilling/phpnuxbill commit c3c2a92d468a — awaiting tagged release

https://github.com/hotspotbilling/phpnuxbill/commit/c3c2a92d468af91136d747b75142ed72f10320cc
githubMentions a patch (unverified)🟡 PoC Available

Unauthenticated account takeover via weak-random reset OTP and password-reset verification with no rate limiting/lockout · Advisory · hotspotbilling/phpnuxbill · GitHub

https://github.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-337r-rrrc-r559

Vendor Advisories for CVE-2026-108109(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 12× 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. 2026-10-10 05:42 UTCGHSA enrichment
  2. 2026-10-10 01:59 UTCGHSA enrichment
  3. 2026-10-09 22:16 UTCGHSA enrichment
  4. 2026-10-09 18:34 UTCEG score recompute
  5. 2026-10-09 18:34 UTCGHSA enrichment
  6. 2026-10-09 17:34 UTCEG score recompute
  7. 2026-10-09 17:34 UTCGHSA enrichment
  8. 2026-10-09 16:53 UTCGHSA enrichment
  9. 2026-10-09 15:32 UTCEG score recompute
  10. 2026-10-09 15:32 UTCGHSA enrichment
  11. 2026-10-09 14:46 UTCEG score recompute
  12. 2026-10-09 14:43 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-108109?
CVE-2026-108109 is a critical vulnerability published on October 9, 2026. PHPNuxBill through 2025.3.20 contains an account takeover vulnerability in the customer password reset flow in system/controllers/forgot.php that allows unauthenticated attackers to brute-force the 6-digit otp_code. Attackers knowing a customer username can guess the code without attempt limits or…
When was CVE-2026-108109 disclosed?
CVE-2026-108109 was first published on October 9, 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-2026-108109?
CVE-2026-108109 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-108109?
No fix for CVE-2026-108109 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-108109 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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