CVE-2026-15311

LOW

NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting

Title source: cna
STIX 2.1

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.

References (7)

Core 7
Core References
Vdb Entry, Technical Description vdb-entry technical-description
VDB-377247 | NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting
https://vuldb.com/vuln/377247
Signature, Permissions Required signature permissions-required
VDB-377247 | CTI Indicators (IOB, IOC, TTP, IOA)
https://vuldb.com/vuln/377247/cti
Third Party Advisory third-party-advisory
CVE-2026-15311 | CVE Analysis and Report
https://vuldb.com/cve/CVE-2026-15311
Third Party Advisory third-party-advisory
Submit #852843 | NousResearch hermes-agent 2026.5.29.2 Cross-site Scripting (CWE-79)
https://vuldb.com/submit/852843

Scores

CVSS v3 3.5
EPSS 0.0020
EPSS Percentile 10.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-79 CWE-94
Status published
Products (3)
NousResearch/hermes-agent 2026.5.29.0
NousResearch/hermes-agent 2026.5.29.1
NousResearch/hermes-agent 2026.5.29.2
Published Jul 10, 2026
Tracked Since Jul 10, 2026