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websafe-kb/07-framework-security/platforms/mattermost/cases/mattermost-cve-2026-24458.md

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---
title: "Mattermost fails to properly handle very long passwords"
system_id: "mattermost"
category: "platforms"
advisory_mode: "core"
published_date: "2026-03-16T15:30:42Z"
updated_date: "2026-03-23T18:56:03.732922Z"
severity: "low"
exploit_status: "unknown"
source_confidence: "ecosystem-authority"
verification_status: "triage-manual"
verification_mode: "synthetic"
artifact_mode: "synthetic"
last_run_id: ""
target_types:
- "lab-local"
- "lab-public"
- "authorized-third-party"
allow_public_validation: "yes, with ownership or explicit authorization"
authorization_prerequisite: "asset ownership proof or explicit written authorization"
minimal_validation: "read-only probe, controlled payload, reversible test"
aliases:
- "CVE-2026-24458"
- "GO-2026-4731"
- "GHSA-m5rv-56xx-hfc6"
affected_versions:
- "introduced=0, fixed<8.0.0-20260129164748-7201f42d955f"
- "introduced=0, fixed<5.3.2-0.20260129164748-7201f42d955f"
- "introduced=10.11.0-rc1, fixed<10.11.11"
- "introduced=11.2.0-rc1, fixed<11.2.3"
- "introduced=11.3.0-rc1, fixed<11.3.1"
- "introduced=10.11.0-rc1+incompatible, fixed<10.11.11+incompatible"
- "introduced=0"
fixed_versions:
- "8.0.0-20260129164748-7201f42d955f"
- "5.3.2-0.20260129164748-7201f42d955f"
- "10.11.11"
- "11.2.3"
- "11.3.1"
- "10.11.11+incompatible"
- "11.2.3+incompatible"
- "11.3.1+incompatible"
entity_refs:
- "mattermost:system:root-system"
- "mattermost--repo--github-com-mattermost-mattermost-server:repo:affected-component"
secure_code_topics:
- "authz-server-side-recheck"
- "xss-output-encoding"
- "token-cookie-storage"
- "dependency-upgrade-policy"
primary_source: "https://nvd.nist.gov/vuln/detail/CVE-2026-24458"
---
# Mattermost fails to properly handle very long passwords
## 本地实证状态
- 实证状态: `triage-manual`
- 实证方式: `synthetic`
- Artifact 模式: `synthetic`
- 最近运行: `-`
- 浏览器证据: `missing`
- Run Bundle: `-`
## 事件层
- Canonical ID: `mattermost--CVE-2026-24458`
- 系统: `mattermost`
- 严重度: `low`
- 来源置信度: `ecosystem-authority`
- 官方主源: https://nvd.nist.gov/vuln/detail/CVE-2026-24458
- 影响版本: `introduced=0, fixed<8.0.0-20260129164748-7201f42d955f, introduced=0, fixed<5.3.2-0.20260129164748-7201f42d955f, introduced=10.11.0-rc1, fixed<10.11.11, introduced=11.2.0-rc1, fixed<11.2.3, introduced=11.3.0-rc1, fixed<11.3.1, introduced=10.11.0-rc1+incompatible, fixed<10.11.11+incompatible, introduced=0`
- 修复版本: `8.0.0-20260129164748-7201f42d955f, 5.3.2-0.20260129164748-7201f42d955f, 10.11.11, 11.2.3, 11.3.1, 10.11.11+incompatible, 11.2.3+incompatible, 11.3.1+incompatible`
## 对象与版本映射
- Advisory Scope: `repo`
- 影响对象: `mattermost / mattermost-server`
- Entity Refs: `mattermost, mattermost--repo--github-com-mattermost-mattermost-server`
- 版本置信度: `high`
- 版本缺口: `-`
- 版本证据源: `https://nvd.nist.gov/vuln/detail/CVE-2026-24458, https://github.com/advisories/GHSA-m5rv-56xx-hfc6, https://github.com/mattermost/mattermost/commit/7201f42d955f1bc44719b862132546626b60a180, https://github.com/mattermost/mattermost, https://mattermost.com/security-updates`
## 受控验证流程
- Workflow ID: `mattermost--CVE-2026-24458--workflow`
- 漏洞家族: `unknown`
- 入口面: `repo-surface`
- 需要角色: `unknown`
- 触发向量: 对 `unknown` 家族入口投递最小化、可审计、可回滚的受控输入，比较修复前后差异。
- 请求/页面入口: `/repo`
- 输入形态: 提交最小化、可审计、可回滚的受控输入。
- 预期不安全行为: 目标表现出超出设计边界的行为。
## 其他来源
- https://github.com/advisories/GHSA-m5rv-56xx-hfc6
- https://github.com/mattermost/mattermost/commit/7201f42d955f1bc44719b862132546626b60a180
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
## 证据点与补丁验证
### 服务端证据点
- 应用日志中的命中路径、鉴权决策和异常栈
- 反向代理或边界层日志中的请求头、来源 IP 与路由决策
### 浏览器证据点
- 基线截图与攻击后截图的 DOM/视觉差异
- console、network 与 response metadata 中的异常信号
### 数据库/文件系统证据点
- 数据库中新增/越权读取的测试数据
- 文件系统中新增上传样本、缓存条目或越权读取痕迹
### 检测信号
- WAF / reverse proxy 异常日志、访问日志和告警
- 应用审计日志中的权限错误、重定向异常、模板渲染或上传落盘事件
### 补丁验证步骤
- 确认目标版本从 `introduced=0, fixed<8.0.0-20260129164748-7201f42d955f, introduced=0, fixed<5.3.2-0.20260129164748-7201f42d955f, introduced=10.11.0-rc1, fixed<10.11.11` 升级或回移到 `8.0.0-20260129164748-7201f42d955f`。
- 保留同一组受控输入，在修复前后分别执行并比对响应、日志与浏览器证据。
- 确认修复后仅保留预期业务行为，不再触发越权、回显、异常渲染或错误请求。
- 补充 `unknown` 族自动化回归，避免同类路径在插件、主题或代理链中回归。
### 实验安全备注
- 只使用回环地址、哨兵目标、无害样本或可回滚测试数据。
- 禁止造成持久破坏、越权下载真实数据或不可回滚 side effect。
- 如需浏览器证据，保留 baseline / proof 两份快照以及 console / network 记录。
## 实验层
- 仅用于自有资产、测试环境或已明确授权目标。
- 允许公网可达目标，但必须满足资产归属或明确授权前提。
- 最小化验证方式: 最小化验证、只读探测、可审计回显、受控注入。
- 若该案例涉及插件、模块或扩展，应同时检查供应链与升级策略。
- 禁止场景: 无归属证明或无明确授权的公网目标；知名公共网站或与测试无关的第三方资产；会造成持久破坏、数据越权下载或不可回滚影响的动作
## 修复示例
- [javascript-typescript:authz-server-side-recheck](/Users/x/websafe/05-defense/secure-code/javascript-typescript/authz-server-side-recheck.md)
- [nodejs:authz-server-side-recheck](/Users/x/websafe/05-defense/secure-code/nodejs/authz-server-side-recheck.md)
- [java:authz-server-side-recheck](/Users/x/websafe/05-defense/secure-code/java/authz-server-side-recheck.md)
- [php:authz-server-side-recheck](/Users/x/websafe/05-defense/secure-code/php/authz-server-side-recheck.md)
- [python:authz-server-side-recheck](/Users/x/websafe/05-defense/secure-code/python/authz-server-side-recheck.md)
- [ruby:authz-server-side-recheck](/Users/x/websafe/05-defense/secure-code/ruby/authz-server-side-recheck.md)
- [csharp:authz-server-side-recheck](/Users/x/websafe/05-defense/secure-code/csharp/authz-server-side-recheck.md)
- [go:authz-server-side-recheck](/Users/x/websafe/05-defense/secure-code/go/authz-server-side-recheck.md)
- [javascript-typescript:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/javascript-typescript/xss-output-encoding.md)
- [nodejs:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/nodejs/xss-output-encoding.md)
- [java:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/java/xss-output-encoding.md)
- [php:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/php/xss-output-encoding.md)
- [python:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/python/xss-output-encoding.md)
- [ruby:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/ruby/xss-output-encoding.md)
- [csharp:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/csharp/xss-output-encoding.md)
- [go:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/go/xss-output-encoding.md)
- [javascript-typescript:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/javascript-typescript/token-cookie-storage.md)
- [nodejs:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/nodejs/token-cookie-storage.md)
- [java:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/java/token-cookie-storage.md)
- [php:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/php/token-cookie-storage.md)
- [python:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/python/token-cookie-storage.md)
- [ruby:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/ruby/token-cookie-storage.md)
- [csharp:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/csharp/token-cookie-storage.md)
- [go:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/go/token-cookie-storage.md)
- [javascript-typescript:dependency-upgrade-policy](/Users/x/websafe/05-defense/secure-code/javascript-typescript/dependency-upgrade-policy.md)
- [nodejs:dependency-upgrade-policy](/Users/x/websafe/05-defense/secure-code/nodejs/dependency-upgrade-policy.md)
- [java:dependency-upgrade-policy](/Users/x/websafe/05-defense/secure-code/java/dependency-upgrade-policy.md)
- [php:dependency-upgrade-policy](/Users/x/websafe/05-defense/secure-code/php/dependency-upgrade-policy.md)
- [python:dependency-upgrade-policy](/Users/x/websafe/05-defense/secure-code/python/dependency-upgrade-policy.md)
- [ruby:dependency-upgrade-policy](/Users/x/websafe/05-defense/secure-code/ruby/dependency-upgrade-policy.md)
- [csharp:dependency-upgrade-policy](/Users/x/websafe/05-defense/secure-code/csharp/dependency-upgrade-policy.md)
- [go:dependency-upgrade-policy](/Users/x/websafe/05-defense/secure-code/go/dependency-upgrade-policy.md)
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