# CWE-648: Incorrect Use of Privileged APIs **Likelihood of exploit:** Low · **KEV-linked** > As of 2026-10-05, CWE-648 (Incorrect Use of Privileged APIs) underlies 3 CVEs tracked by Threadlinqs, 1 of them in the CISA Known Exploited Vulnerabilities catalog, and is cited by 4 tracked threats. MITRE rates its likelihood of exploit as Low. **Last updated:** 2026-10-05 ## What is CWE-648? The product does not conform to the API requirements for a function call that requires extra privileges. This could allow attackers to gain privileges by causing the function to be called incorrectly. When a product contains certain functions that perform operations requiring an elevated level of privilege, the caller of a privileged API must be careful to: ensure that assumptions made by the APIs are valid, such as validity of arguments account for known weaknesses in the design/implementation of the API call the API from a safe context If the caller of the API does not follow these requirements, then it may allow a malicious user or process to elevate their privilege, hijack the process, or steal sensitive data. For instance, it is important to know if privileged APIs do not shed their privileges before returning to the caller or if the privileged function might make certain assumptions about the data, context or state information passed to it by the caller. It is important to always know when and how privileged APIs can be called in order to ensure that their elevated level of privilege cannot be exploited. CWE-648 is a base-level weakness in MITRE’s Common Weakness Enumeration, with a MITRE likelihood of exploit of Low. Applicable platforms: Language: Not Language-Specific. _Source: [MITRE CWE](https://cwe.mitre.org/data/definitions/648.html) (CWE-648 definition, reproduced verbatim). Counts and linkage below are Threadlinqs data._ ## Consequences - **Access Control** — Gain Privileges or Assume Identity. An attacker may be able to elevate privileges. - **Confidentiality** — Read Application Data. An attacker may be able to obtain sensitive information. - **Integrity, Confidentiality, Availability** — Execute Unauthorized Code or Commands. An attacker may be able to execute code. _Source: MITRE CWE, common consequences._ ## How CWE-648 is exploited in the wild Threadlinqs maps 3 CVEs to CWE-648, published between 2026-02-25 and 2026-09-16. 1 is listed in CISA’s Known Exploited Vulnerabilities catalog, the authoritative record of exploitation in the wild. By CVSS v3 severity the set splits into 1 critical, 1 high, 1 medium. The highest EPSS score in the set is 0.0% (CVE-2026-20126), the modelled probability of exploitation in the next 30 days. 4 tracked threats reference CWE-648 directly or through a CVE it covers; the most recent is “Eclypsium InfraTrust Report: Mass Active Exploitation of Network Management Systems (Cisco FMC/ISE CVE-2026-20079, CVE-2026-76460; SonicWall SMA 1000 CVE-2026-83548/83549; Linux Kernel CopyFail CVE-2026-31431)” (2026-09-23). Affected products concentrate in Cisco (3). ## Vulnerabilities (CVEs) All 3 CVEs mapped to CWE-648, CISA KEV first, then by CVSS score. - [CVE-2026-76460](https://intel.threadlinqs.com/cve/CVE-2026-76460) — CISA KEV · CVSS 10 critical · published 2026-09-16 - [CVE-2026-20126](https://intel.threadlinqs.com/cve/CVE-2026-20126) — CVSS 8.8 high · EPSS 0.0% · published 2026-02-25 - [CVE-2026-20122](https://intel.threadlinqs.com/cve/CVE-2026-20122) — CVSS 5.4 medium · EPSS 0.0% · published 2026-02-25 ## Affected vendors - [Cisco](https://intel.threadlinqs.com/vendors/cisco) — 3 CVEs ## Threat activity 4 tracked threats cite CWE-648: - [Eclypsium InfraTrust Report: Mass Active Exploitation of Network Management Systems (Cisco FMC/ISE CVE-2026-20079, CVE-2026-76460; SonicWall SMA 1000 CVE-2026-83548/83549; Linux Kernel CopyFail CVE-2026-31431)](https://intel.threadlinqs.com/threat/TL-2026-2630) — CRITICAL · 2026-09-23 - [CISA KEV Catalog Addition: Active Exploitation of Cisco ISE Authentication Bypass (CVE-2026-76460) and Acronis Backup Privilege Escalation (CVE-2026-87886)](https://intel.threadlinqs.com/threat/TL-2026-2542) — CRITICAL · 2026-09-16 - [CVE-2026-20127: Critical Cisco Catalyst SD-WAN Authentication Bypass Exploited by UAT-8616 Since 2023 (CVSS 10.0)](https://intel.threadlinqs.com/threat/TL-2026-0236) — CRITICAL · 2026-03-16 - [Cisco Catalyst SD-WAN Manager Active Exploitation — Arbitrary File Overwrite and Credential Exposure (CVE-2026-20122, CVE-2026-20128)](https://intel.threadlinqs.com/threat/TL-2026-0185) — CRITICAL · 2026-03-06 ## Mitigations - **Implementation**: Before calling privileged APIs, always ensure that the assumptions made by the privileged code hold true prior to making the call. - **Architecture and Design**: Know architecture and implementation weaknesses of the privileged APIs and make sure to account for these weaknesses before calling the privileged APIs to ensure that they can be called safely. - **Implementation**: If privileged APIs make certain assumptions about data, context or state validity that are passed by the caller, the calling code must ensure that these assumptions have been validated prior to making the call. - **Implementation**: If privileged APIs do not shed their privilege prior to returning to the calling code, then calling code needs to shed these privileges immediately and safely right after the call to the privileged APIs. In particular, the calling code needs to ensure that a privileged thread of execution will never be returned to the user or made available to user-controlled processes. - **Implementation**: Only call privileged APIs from safe, consistent and expected state. - **Implementation**: Ensure that a failure or an error will not leave a system in a state where privileges are not properly shed and privilege escalation is possible (i.e. fail securely with regards to handling of privileges). _Source: MITRE CWE, potential mitigations._ ## Related weaknesses - [CWE-269 Improper Privilege Management](https://intel.threadlinqs.com/cwe/CWE-269) Canonical: https://intel.threadlinqs.com/cwe/CWE-648 Source definition: https://cwe.mitre.org/data/definitions/648.html Detection rules and IOCs for threats exploiting CWE-648 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp