CVE-2025-68624

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-14. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: Elevated riskExposed: 0

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

N-able Mail Assure through April 2026 contains a design-level authorization flaw that allows an authenticated SMTP user to send outbound email using MAIL FROM addresses belonging to other tenants. When connecting to the SMTP TCP port and performing SMTP AUTH with valid credentials, the server accepts arbitrary sender domains without enforcing any domain-to-account binding. As a result, an attacker from any tenant can impersonate other tenant domains, producing messages that pass SPF and DMARC validation. NOTE: N-able's position is that the behavior is intended functionality of its shared SMTP relay architecture and that the service does not represent that it enforces per-tenant sender-domain binding.

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 17, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🟡 PoC Available

CVE-2025-68624 — Cross-Tenant Authentication Bypass by Spoofing in N-able Mail Assure · GitHub

https://gist.github.com/alessandrobertoldi/1ebe0f48aa0119d787ac0ff710057d92
generic🔴 Active Exploitation

Speakers (preliminary) - DeepSec IDSC 2026 Europe

https://deepsec.net/speaker.html#PSLOT782
generic

Email Protection Software - Mail Assure - N-able

https://www.n-able.com/products/mail-assure

Vendor Advisories for CVE-2025-68624(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 20× in last 7d / 20× 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. 2026-09-18 21:16 UTCEG score recompute
  2. 2026-09-18 21:16 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-17 19:30 UTCEPSS rescore
  5. 2026-09-17 18:12 UTCEG score recompute
  6. 2026-09-17 18:12 UTCGHSA enrichment
  7. 2026-09-16 23:36 UTCEG score recompute
  8. 2026-09-16 23:36 UTCGHSA enrichment
  9. 2026-09-16 14:07 UTCEPSS rescore
  10. 2026-09-16 05:14 UTCEPSS rescore
  11. 2026-09-15 21:28 UTCEG score recompute
  12. 2026-09-15 21:28 UTCGHSA enrichment
  13. 2026-09-15 03:10 UTCEPSS rescore
  14. 2026-09-14 19:20 UTCEG score recompute
  15. 2026-09-14 19:20 UTCGHSA enrichment
  16. 2026-09-14 18:27 UTCEG score recompute
  17. 2026-09-14 18:27 UTCGHSA enrichment
  18. 2026-09-14 01:20 UTCEG score recompute
  19. 2026-09-14 00:40 UTCEG score recompute
  20. 2026-09-14 00:39 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2025-68624?
CVE-2025-68624 is a medium vulnerability published on September 14, 2026. N-able Mail Assure through April 2026 contains a design-level authorization flaw that allows an authenticated SMTP user to send outbound email using MAIL FROM addresses belonging to other tenants. When connecting to the SMTP TCP port and performing SMTP AUTH with valid credentials, the server…
When was CVE-2025-68624 disclosed?
CVE-2025-68624 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-68624 actively exploited?
CVE-2025-68624 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 77.9% of all scored CVEs.
What is the CVSS score of CVE-2025-68624?
CVE-2025-68624 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2025-68624?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-68624, 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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