BaseFortify

Publication date: 2025-10-16

Last updated on: 2025-10-21

Assigner: Mattermost, Inc.

Description

Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to use constant-time comparison for sensitive string comparisons which allows attackers to exploit timing oracles to perform byte-by-byte brute force attacks via response time analysis on Cloud API keys and OAuth client secrets

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-10-16

Last Modified

2025-10-21

Generated

2026-07-06

AI Q&A

2025-10-16

EPSS Evaluated

2026-07-04

NVD

CVE-2025-54499

EUVD

EUVD-2025-34730

Affected Vendors & Products

Vendor	Product	Version / Range
mattermost	mattermost_server	From 10.5.0 (inc) to 10.5.11 (exc)
mattermost	mattermost_server	From 10.11.0 (inc) to 10.11.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-208	Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Mattermost versions 10.5.x up to 10.5.10 and 10.11.x up to 10.11.2, where the software fails to use constant-time comparison for sensitive string comparisons. This flaw allows attackers to exploit timing oracles by analyzing response times to perform byte-by-byte brute force attacks on Cloud API keys and OAuth client secrets.

Impact Analysis

An attacker can use this vulnerability to gradually guess sensitive credentials such as Cloud API keys and OAuth client secrets by measuring response times. This can lead to unauthorized access to systems or data protected by these credentials, potentially compromising security.

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