An authentication bypass vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, enabling any attackers to bypass the authentication requirement and achieve pre-authenticated code execution on the system.
CVE-2026-21718
CRITICALNVD 9.810.0▲Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-02-27. NVD baseline CVSS 9.8; sources differ by 0.2.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, nvd
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.8
- EG Score
- 10.0(medium)
- EG Risk
- 50(Track)EG Risk 50/100SSVC: 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 computedSeverity100% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 35%
- KEV
- Not listed
Published
February 27, 2026
Last Modified
June 17, 2026
Advisory Details (3)
Auto-updated Jul 27, 2026⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation
Copeland XWEB and XWEB Pro | CISA
Copeland XWEB and XWEB Pro | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.
https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-10generic
CSAF/csaf_files/OT/white/2026/icsa-26-057-10.json at develop · cisagov/CSAF · GitHub
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-10.jsonWeakness 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 14:13 UTCEPSS rescore
- 2026-07-27 13:35 UTCEG score recompute
- 2026-07-27 13:35 UTCGHSA enrichment
Frequently asked(5)
What is CVE-2026-21718?
CVE-2026-21718 is a critical vulnerability published on February 27, 2026. An authentication bypass vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, enabling any attackers to bypass the authentication requirement and achieve pre-authenticated code execution on the system.
When was CVE-2026-21718 disclosed?
CVE-2026-21718 was first published in the National Vulnerability Database on February 27, 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-2026-21718 actively exploited?
CVE-2026-21718 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 64.9% of all scored CVEs.
What is the CVSS score of CVE-2026-21718?
CVE-2026-21718 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 10.0.
How do I remediate CVE-2026-21718?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21718, 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-2026-21718
Is Your Infrastructure Affected by CVE-2026-21718?
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