2026-10-17 21:56 CEST · Intelligence refreshed (Europe/Stockholm)
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CVSS 4.3Published 2026-10-17 21:00 CEST
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1 affected products/devices1 software
General vulnerability queryRecent High & critical CVEs
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CVSS 9.1/10Critical severity
First published: 15 October 2026, 20:45 CEST · Last modified: 16 October 2026, 21:59 CEST
CVE lookup — correlated security and lifecycle intelligence
· 7 sources correlated
Critical severity — prioritize remediation
OpenNMS REST authorization bypass via non-canonical HTTP method
SeverityCVSS 9.1Critical · Remote / network
ExploitationNone reportedEPSS 0.4% chance in 30 days
An authorization bypass vulnerability exists in the REST API of multiple versions of OpenNMS Meridian and Horizon. The /rest/** Spring Security filter chains authorize requests with intercept-url rules that name the HTTP method as an uppercase token, compare the method case-sensitively, and have no terminal deny rule. A request that uses a non-canonical (for example lowercase) method token matches no rule and is processed without authentication. A remote, unauthenticated attacker can read the monitored inventory a…
Detailed evidence Everything below supports the summary above. Open only what you need.
Matched intelligence coverage 7 sources
EUVDVulnrichmentGHSAEPSSCWECVEAffected Products
Cross-source correlations 7 matched lanes
Direct intelligence-source relationships
Direct intelligence-source lanes: every lane below has direct evidence for
in that Scantide intelligence collection. Lanes share the CVE as their join key; their presence together does not imply that one source explicitly referenced another source's record.
These vendors are derived from affected product/device evidence tied to this CVE. This is intentionally separate from the direct intelligence-source lanes above: a vendor can have affected products without Scantide having a vendor-specific advisory or Microsoft KB record for the CVE.
1 affected vendors represented
Affected software, operating systems, hardware and devices 8
Deduplicated across Scantide's structured CVE, NVD applicability, CSAF, vendor advisory, campaign and downstream product evidence. Taxonomy IDs and evidence-only identifiers are excluded from the asset count. Counts represent relationships Scantide can currently prove, not the theoretical maximum downstream ecosystem.
An authorization bypass vulnerability exists in the REST API of multiple versions of OpenNMS Meridian and Horizon. The /rest/** Spring Security filter chains authorize requests with intercept-url rules that name the HTTP method as an uppercase token, compare the method case-sensitively, and have no terminal deny rule. A request that uses a non-canonical (for example lowercase) method token matches no rule and is processed without authentication. A remote, unauthenticated attacker can read the monitored inventory and can create, modify, or delete resources through the REST API, which includes injecting events to fabricate or suppress alarms. The /rest/alarms chain has the same missing deny rule and discloses whether an alarm exists through a difference in the response. The fix adds a terminal deny rule to each REST filter chain. The solution is to upgrade to Meridian 2024.3.14, 2025.0.11, 2026.0.1 and Horizon 36.0.5 or newer. Meridian and Horizon installation instructions state that th…
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Affected-product scope: The product/device count is the deduplicated set Scantide can prove from its currently ingested structured records and advisory text. It is not a claim that only those products were affected; component vulnerabilities such as Log4Shell can have a much larger downstream ecosystem. Advisory and vendor references are kept clickable so additional downstream exposure can be followed to the authoritative source.
Coverage note: Scantide correlates multiple public and locally indexed intelligence sources, but no dataset or matching process is complete. Results may omit software, dependencies, affected versions or advisories, and related records do not by themselves prove that a specific installation is vulnerable. Confirm important findings against vendor guidance and the installed product and version.