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CVE-2026-116516— Insufficient length validation when parsing Zoom chat transcriptions

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 版本 ≤11.9、11.1.9、11.5.8 和 11.10.7.0 在切片前未对 Zoom 聊天行长度进行验证，导致已认证的攻击者可通过总结包含短续行（short continuation lines）的 Zoom 聊天转录内容，使 Agents 插件崩溃。Mattermost 安全公告编号：MMSA-2026-00723。

CVSS 6.5 · Medium EPSS 0.36% · P30

Affected Version Matrix 5

VendorProduct Version RangeStatus
Mattermost Mattermost <=11.9 11.1.9 11.5.8 11.10.7.0≤ <=11.9 11.1.9 11.5.8 11.10.7.0 affected
11.10.0 unaffected
11.9.2 unaffected
11.8.6 unaffected
11.7.11 unaffected
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I. Basic Information for CVE-2026-116516

Vulnerability Information
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Vulnerability Title
Insufficient length validation when parsing Zoom chat transcriptions
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions <=11.9 11.1.9 11.5.8 11.10.7.0 fail to validate Zoom chat line length before slicing which allows an authenticated attacker to crash the Agents plugin via summarizing a Zoom chat transcription containing short continuation lines. Mattermost Advisory ID: MMSA-2026-00723
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost <=11.9 11.1.9 11.5.8 11.10.7.0 ~ <=11.9 11.1.9 11.5.8 11.10.7.0 -

II. Public POCs for CVE-2026-116516

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III. Intelligence Information for CVE-2026-116516

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Same Patch Batch · Mattermost · 2026-10-26 · 6 CVEs total

CVE-2026-93849 6.5 MEDIUM Mattermost allows authenticated users to trigger excessive memory allocation via crafted m
CVE-2026-93850 6.5 MEDIUM Unbounded memory consumption during PDF text extraction
CVE-2026-93846 3.8 LOW Team admin can escalate a team member's permissions via the team member roles endpoint
CVE-2026-93847 3.5 LOW Improper post type validation on scheduled post endpoints
CVE-2026-93848 2.7 LOW Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allow

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-754