CVE-2026-27480 Vulnerability Analysis & Exploit Details

CVE-2026-27480
Vulnerability Scoring

5.3
/10
Significant Risk

Security assessments indicate that CVE-2026-27480 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-27480 Details

Status: Analyzed

Last updated: 🕟 24 Feb 2026, 16:55 UTC
Originally published on: 🕙 21 Feb 2026, 10:16 UTC

Time between publication and last update: 3 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVE-2026-27480 Vulnerability Summary

CVE-2026-27480: Static Web Server (SWS) is a production-ready web server suitable for static web files or assets. In versions 2.1.0 through 2.40.1, a timing-based username enumeration vulnerability in Basic Authentication allows attackers to identify valid users by exploiting early responses for invalid usernames, enabling targeted brute-force or credential-stuffing attacks. SWS checks whether a username exists before verifying the password, causing valid usernames to follow a slower code path (e.g., bcrypt hashing) while invalid usernames receive an immediate 401 response. This timing discrepancy allows attackers to enumerate valid accounts by measuring response-time differences. This issue has been fixed in version 2.41.0.

Assessing the Risk of CVE-2026-27480

Access Complexity Graph

The exploitability of CVE-2026-27480 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-27480

With low attack complexity and no required privileges, CVE-2026-27480 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-27480, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-27480, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2026-27480 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: None
    CVE-2026-27480 poses no threat to data integrity.
  • Availability: None
    CVE-2026-27480 does not impact system availability.

CVE-2026-27480 References

External References

CWE Common Weakness Enumeration

CWE-204

CAPEC Common Attack Pattern Enumeration and Classification

  • ICMP IP Total Length Field Probe CAPEC-331 An adversary sends a UDP packet to a closed port on the target machine to solicit an IP Header's total length field value within the echoed 'Port Unreachable" error message. This type of behavior is useful for building a signature-base of operating system responses, particularly when error messages contain other types of information that is useful identifying specific operating system responses.
  • ICMP IP 'ID' Field Error Message Probe CAPEC-332 An adversary sends a UDP datagram having an assigned value to its internet identification field (ID) to a closed port on a target to observe the manner in which this bit is echoed back in the ICMP error message. This allows the attacker to construct a fingerprint of specific OS behaviors.
  • Application Fingerprinting CAPEC-541 An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.
  • System Footprinting CAPEC-580 An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.

Vulnerable Configurations

  • cpe:2.3:a:static-web-server:static_web_server:2.1.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.1.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.2.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.2.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.3.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.3.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.4.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.4.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.5.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.5.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.6.0:-:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.6.0:-:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.6.0:beta1:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.6.0:beta1:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.6.0:beta2:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.6.0:beta2:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.7.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.7.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.7.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.7.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.8.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.8.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.9.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.9.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.10.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.10.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.11.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.11.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.12.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.12.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.13.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.13.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.13.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.13.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.14.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.14.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.14.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.14.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.14.2:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.14.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.15.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.15.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.16.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.16.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.17.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.17.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.18.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.18.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.19.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.19.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.20.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.20.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.20.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.20.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.20.2:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.20.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.21.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.21.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.21.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.21.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.22.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.22.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.22.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.22.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.23.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.23.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.24.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.24.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.24.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.24.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.24.2:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.24.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.25.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.25.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.26.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.26.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.27.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.27.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.28.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.28.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.30.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.30.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.31.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.31.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.31.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.31.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.32.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.32.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.32.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.32.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.32.2:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.32.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.33.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.33.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.33.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.33.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.34.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.34.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.35.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.35.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.36.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.36.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.36.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.36.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.37.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.37.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.38.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.38.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.38.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.38.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.39.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.39.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.40.0:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.40.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:static-web-server:static_web_server:2.40.1:*:*:*:*:rust:*:*
    cpe:2.3:a:static-web-server:static_web_server:2.40.1:*:*:*:*:rust:*:*

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