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CVE-2026-4053— post edit time limit is not enforced on some post update operations

Quick assessment

Affected
Mattermost Mattermost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11.5.1及之前版本、10.11.13及之前版本存在安全漏洞，该漏洞源于未对非消息帖子字段强制执行PostEditTimeLimit，可能导致经过身份验证的用户在编辑窗口过期后通过帖子补丁和更新API端点修改帖子文件附件、属性和固定状态。

CVSS 3.1 · Low EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1114.001 · Local Email Collection

Affected Version Matrix 5

VendorProduct Version RangeStatus
Mattermost Mattermost 11.5.0≤ 11.5.1 affected
10.11.0≤ 10.11.13 affected
11.6.0 unaffected
11.5.2 unaffected
10.11.14 unaffected
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I. Basic Information for CVE-2026-4053

Vulnerability Information
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Vulnerability Title
post edit time limit is not enforced on some post update operations
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired via the post patch and update API endpoints.. Mattermost Advisory ID: MMSA-2026-00631
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在过期或释放后对资源进行操作
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11.5.1及之前版本、10.11.13及之前版本存在安全漏洞，该漏洞源于未对非消息帖子字段强制执行PostEditTimeLimit，可能导致经过身份验证的用户在编辑窗口过期后通过帖子补丁和更新API端点修改帖子文件附件、属性和固定状态。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost 11.5.0 ~ 11.5.1 -

II. Public POCs for CVE-2026-4053

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III. Intelligence Information for CVE-2026-4053

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IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-672

V. Comments for CVE-2026-4053

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