SB20260728107 - Improper Certificate Validation in Mastodon

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Main Vulnerability Database SB20260728107

SB20260728107 - Improper Certificate Validation in Mastodon

Published: July 28, 2026

Security Bulletin ID SB20260728107
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Certificate Validation (CVE-ID: CVE-2026-59825)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information and tamper with data in transit.

The vulnerability exists due to improper certificate validation in SSL/TLS certificate verification for web process outbound requests when LDAP authentication is configured with certificate verification disabled. A remote attacker can present a forged or untrusted certificate to disclose sensitive information and tamper with data in transit.

Only instances using LDAP authentication with the environment variable LDAP_TLS_NO_VERIFY set to true are vulnerable, and only requests made from web processes are affected.


Remediation

Install update from vendor's website.

References