CVE-2026-21885 Vulnerability Analysis & Exploit Details

CVE-2026-21885
Vulnerability Scoring

6.5
/10
High Risk

If left unpatched, CVE-2026-21885 could lead to major system disruptions or data loss.

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: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-21885 Details

Status: Analyzed

Last updated: 🕟 12 Jan 2026, 16:55 UTC
Originally published on: 🕑 08 Jan 2026, 14:15 UTC

Time between publication and last update: 4 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-21885 Vulnerability Summary

CVE-2026-21885: Miniflux 2 is an open source feed reader. Prior to version 2.2.16, Miniflux's media proxy endpoint (`GET /proxy/{encodedDigest}/{encodedURL}`) can be abused to perform Server-Side Request Forgery (SSRF). An authenticated user can cause Miniflux to generate a signed proxy URL for attacker-chosen media URLs embedded in feed entry content, including internal addresses (e.g., localhost, private RFC1918 ranges, or link-local metadata endpoints). Requesting the resulting `/proxy/...` URL makes Miniflux fetch and return the internal response. Version 2.2.16 fixes the issue.

Assessing the Risk of CVE-2026-21885

Access Complexity Graph

The exploitability of CVE-2026-21885 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-2026-21885

CVE-2026-21885 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

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-2026-21885, 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-2026-21885, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-21885 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: None
    CVE-2026-21885 poses no threat to data integrity.
  • Availability: None
    CVE-2026-21885 does not impact system availability.

CVE-2026-21885 References

External References

CWE Common Weakness Enumeration

CWE-918

CAPEC Common Attack Pattern Enumeration and Classification

  • Server Side Request Forgery CAPEC-664 An adversary exploits improper input validation by submitting maliciously crafted input to a target application running on a server, with the goal of forcing the server to make a request either to itself, to web services running in the server’s internal network, or to external third parties. If successful, the adversary’s request will be made with the server’s privilege level, bypassing its authentication controls. This ultimately allows the adversary to access sensitive data, execute commands on the server’s network, and make external requests with the stolen identity of the server. Server Side Request Forgery attacks differ from Cross Site Request Forgery attacks in that they target the server itself, whereas CSRF attacks exploit an insecure user authentication mechanism to perform unauthorized actions on the user's behalf.

Vulnerable Configurations

  • cpe:2.3:a:miniflux_project:miniflux:2.0.0:-:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.0:-:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.0:rc1:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.0:rc1:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.1:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.1:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.2:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.2:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.3:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.3:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.4:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.4:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.5:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.5:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.6:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.6:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.7:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.7:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.8:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.8:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.9:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.9:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.10:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.10:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.11:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.11:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.12:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.12:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.13:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.13:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.14:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.14:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.15:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.15:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.16:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.16:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.17:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.17:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.18:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.18:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.19:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.19:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.20:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.20:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.21:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.21:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.22:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.22:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.23:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.23:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.24:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.24:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.25:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.25:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.26:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.26:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.27:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.27:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.28:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.28:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.29:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.29:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.30:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.30:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.31:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.31:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.32:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.32:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.33:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.33:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.34:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.34:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.35:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.35:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.36:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.36:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.37:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.37:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.38:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.38:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.39:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.39:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.40:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.40:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.41:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.41:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.42:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.42:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.43:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.43:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.44:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.44:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.45:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.45:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.46:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.46:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.47:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.47:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.48:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.48:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.49:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.49:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.50:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.50:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.0.51:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.0.51:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.1.0:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.1.0:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.1.1:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.1.1:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.1.2:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.1.2:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.1.3:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.1.3:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.1.4:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.1.4:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.0:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.0:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.1:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.1:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.2:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.2:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.3:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.3:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.4:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.4:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.5:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.5:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.6:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.6:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.7:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.7:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.8:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.8:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.9:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.9:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.10:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.10:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.11:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.11:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.12:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.12:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.13:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.13:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.14:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.14:*:*:*:*:go:*:*
  • cpe:2.3:a:miniflux_project:miniflux:2.2.15:*:*:*:*:go:*:*
    cpe:2.3:a:miniflux_project:miniflux:2.2.15:*:*:*:*:go:*:*

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