GFI MailEssentials AI versions prior to 22.4 contain an arbitrary directory existence enumeration vulnerability in the ListServer.IsPathExist() web method exposed at /MailEssentials/pages/MailSecurity/ListServer.aspx/IsPathExist. An authenticated user can supply an unrestricted filesystem path via the JSON key \"path\", which is URL-decoded and passed to Directory.Exists(), allowing the attacker to determine whether arbitrary directories exist on the server.
CVE-2026-23621
MEDIUMPre-NVD 4.34.3—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
Score 4.3 from GitHub Security Advisory published 2026-02-19. a secondary CVSS source baseline 4.3; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.3
- EG Score
- 4.3(medium)
- EG Risk
- 24(Track)EG Risk 24/100SSVC: 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 computedSeverity43% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 16%
- KEV
- Not listed
Published
February 19, 2026
Last Modified
June 17, 2026
Advisory Details (1)
Auto-updated Jul 27, 2026No patch confirmed yet.
generic
GFI MailEssentials AI < 22.4 ListServer.IsPathExist() Absolute Directory Traversal to File Enumeration | Advisories | VulnCheck
https://www.vulncheck.com/advisories/gfi-mailessentials-ai-listserver-ispathexist-absolute-directory-traversal-to-file-enumerationWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× 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.
- 2026-07-27 14:46 UTCEG score recompute
- 2026-07-27 14:46 UTCGHSA enrichment
- 2026-07-27 14:13 UTCEPSS rescore
Related CVEs(same CWE)
Same CWE
10 shownCWE-203
- CVE-2019-10071EG 9.8EPSS p95CRITICAL
- CVE-2018-1000884EG 9.8CRITICAL
- CVE-2017-5753NVD 5.6EG 9.0EPSS p100CRITICAL
- CVE-2017-5715NVD 5.6EG 8.3EPSS p99HIGH
- CVE-2019-10233EG 8.1HIGH
- CVE-2018-9364EG 7.5HIGH
- CVE-2013-10006NVD 2.6EG 7.5HIGH
- CVE-2019-1020002EG 7.5HIGH
- CVE-2019-10114EG 7.5HIGH
- CVE-2017-13099NVD 5.9EG 7.5EPSS p98HIGH
Frequently asked(5)
What is CVE-2026-23621?
CVE-2026-23621 is a medium vulnerability published on February 19, 2026. GFI MailEssentials AI versions prior to 22.4 contain an arbitrary directory existence enumeration vulnerability in the ListServer.IsPathExist() web method exposed at /MailEssentials/pages/MailSecurity/ListServer.aspx/IsPathExist. An authenticated user can supply an unrestricted filesystem path via…
When was CVE-2026-23621 disclosed?
CVE-2026-23621 was first published in the National Vulnerability Database on February 19, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23621 actively exploited?
CVE-2026-23621 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 84.4% of all scored CVEs.
What is the CVSS score of CVE-2026-23621?
CVE-2026-23621 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-23621?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23621, 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
Explore the affected products and dependency analysis for CVE-2026-23621
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