SB2026082522 - Multiple vulnerabilities in Misskey

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Main Vulnerability Database SB2026082522

SB2026082522 - Multiple vulnerabilities in Misskey

Published: August 25, 2026

Security Bulletin ID SB2026082522
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Cross-site scripting (CVE-ID: N/A)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]


The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in RSS feed item links. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


2) Asymmetric Resource Consumption (Amplification) (CVE-ID: N/A)

CWE-ID: CWE-405 - Asymmetric Resource Consumption (Amplification)

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to lack of rate limiting and size restrictions in RSS fetching API. A remote attacker can perform a denial of service (DoS) attack.


3) Incomplete cleanup (CVE-ID: N/A)

CWE-ID: CWE-459 - Incomplete cleanup

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient cleanup processing during file uploads. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.


4) Improper privilege management (CVE-ID: N/A)

CWE-ID: CWE-269 - Improper Privilege Management

CVSSv4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to escalate privileges.

The vulnerability exists due to improper privilege management. A remote administrator can change the password of a non-root user with administrator privileges and gain elevated privileges.


Remediation

Install update from vendor's website.

References