What is CVE-2026-21962?
Critical unauthenticated remote code execution vulnerability (CVSS 10.0) in Oracle HTTP Server and WebLogic Server Proxy Plug-in. Attackers exploit path traversal sequences ('..;' notation) to reach internal ProxyServlet endpoints, enabling arbitrary OS command execution without authentication. Active exploitation observed within hours of public PoC release.
The record classifies CVE-2026-21962 under weakness class CWE-284. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 258 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N - EPSS (FIRST)
- 0.0% probability of exploitation in the next 30 days, higher than 8.0% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 5.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-01-20, last modified 2026-02-03
Is CVE-2026-21962 being exploited?
It currently carries a trending score of 7 in the Threadlinqs vulnerability feed.
Affected products and versions
- Oracle: Http Server, Weblogic Server Proxy Plug-In
How to fix CVE-2026-21962
The record marks a vendor fix as available for CVE-2026-21962. Patch reference: https://www.oracle.com/security-alerts/cpujan2026.html. Vendor advisory: https://www.oracle.com/security-alerts/cpujan2026.html. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-21962
1 tracked threat in the Threadlinqs corpus references CVE-2026-21962, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Seeded from threat-derived and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.