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CVE-2026-21962

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in. For every flaw being used in attacks, see Exploited flaws; for Oracle’s, see Oracle flaws being used in attacks.

CVE-2026-21962 is a security flaw in Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in. Attackers can reach parts of Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in that should be locked to them from anywhere, without logging in. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 24 Aug 2026.[1]

Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Oracle has published a fix or advice.

Description

CISA calls it an improper access control in Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in. In its words: “Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in contain an improper access control vulnerability that can result in unauthorized creation, deletion or modification access to critical data as well as unauthorized access to critical data or complete access to all Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in accessible data.”[1]

The CVE record adds: “Vulnerability in the Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in product of Oracle Fusion Middleware (component: Weblogic Server Proxy Plug-in for Apache HTTP Server, Weblogic Server Proxy Plug-in for IIS). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0 and 14.1.2.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in. While the vulnerability is in Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in accessible data as well as unauthorized access to critical…”[2]

The underlying weakness is improper access control (CWE-284), in MITRE’s list of common software weaknesses.

It scores 10.0 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by the organisation that published the CVE using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it; Oracle’s advisory has them[3]. CISA names the product as Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in.

Most families won’t have Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 24 Aug 2026, 216 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 27 Aug 2026 to fix it.[1]

FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 73%. That’s in the top 1% of the flaws it scores.[4]

CISA assesses it as automatable: attackers can run it against many targets at once.

CISA doesn’t say who was attacked, or how.

Fix

Oracle has published a fix or advice.[3] CISA’s required action: “Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes).”[1]

  1. Check whether you use it.Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 27 Aug 2026 to fix it.
  3. If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.

You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.

Timeline

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 10.0.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at 73%.[4]

See also

Other Oracle flaws

  • CVE-2026-46817, Oracle E-Business Suite: improper privilege management ·
  • CVE-2026-35273, Oracle PeopleSoft Enterprise PeopleTools: missing authentication for critical function ·
  • CVE-2024-21182, Oracle WebLogic Server: unspecified ·
  • CVE-2025-61757, Oracle Fusion Middleware: missing authentication for critical function ·
  • CVE-2025-61884, Oracle E-Business Suite: server-side request forgery (SSRF) ·

Other improper access control flaws

  • CVE-2015-3306, ProFTPD: improper access control ·
  • CVE-2026-56290, Joomlack Page Builder: improper access control ·
  • CVE-2026-34908, Ubiquiti UniFi OS: improper access control ·
  • CVE-2026-48907, Widget Factory Joomla Content Editor: improper access control ·
  • CVE-2026-35616, Fortinet FortiClient EMS: improper access control ·

Every Oracle flaw on CISA’s list · Everything added in August 2026

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “Oracle HTTP Server and Oracle Weblogic Server Proxy Plug-in Improper Access Control Vulnerability”. Known Exploited Vulnerabilities Catalog, added 24 Aug 2026.
  2. ^ National Institute of Standards and Technology. “CVE-2026-21962 Detail”. National Vulnerability Database, published 20 Jan 2026.
  3. ^ Oracle. Advisories and fixes: oracle.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.732, percentile 99.5, 31 Oct 2026.
  5. CVE Program. “CVE-2026-21962”. The official CVE record.

This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.