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CVE-2026-15311— NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting

Quick assessment

Affected
NousResearch hermes-agent
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.

Nous Research Hermes Agent是Nous Research团队开源的一款具备自我学习循环的AI代理工具。 Nous Research Hermes Agent 2026.5.29.2及之前版本存在安全漏洞，该漏洞源于Matrix Adapter组件中gateway/platforms/matrix.py文件的MatrixAdapter._markdown_to_html函数存在跨站脚本漏洞。

CVSS 3.5 · Low EPSS 0.36% · P28

Affected Version Matrix 3

VendorProduct Version RangeStatus
NousResearch hermes-agent 2026.5.29.0 affected
2026.5.29.1 affected
2026.5.29.2 affected
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I. Basic Information for CVE-2026-15311

Vulnerability Information
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Vulnerability Title
NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in NousResearch hermes-agent up to 2026.5.29.2. Affected by this issue is the function MatrixAdapter._markdown_to_html of the file gateway/platforms/matrix.py of the component Matrix Adapter. Such manipulation leads to cross site scripting. The attack can be executed remotely. The exploit is publicly available and might be used. The pull request to fix this issue awaits acceptance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Nous Research Hermes Agent 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nous Research Hermes Agent是Nous Research团队开源的一款具备自我学习循环的AI代理工具。 Nous Research Hermes Agent 2026.5.29.2及之前版本存在安全漏洞，该漏洞源于Matrix Adapter组件中gateway/platforms/matrix.py文件的MatrixAdapter._markdown_to_html函数存在跨站脚本漏洞。
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
NousResearch hermes-agent 2026.5.29.0 cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-15311

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III. Intelligence Information for CVE-2026-15311

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Patches & Fixes for CVE-2026-15311 (1)

News Coverage for CVE-2026-15311 (1)

Other References for CVE-2026-15311 (1)

IV. Related Vulnerabilities

Same product: hermes-agent
Same vendor: NousResearch
Same weakness: CWE-79

V. Comments for CVE-2026-15311

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