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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.

PUBLISHED Reserved 2026-07-09 | Published 2026-07-09 | Updated 2026-07-10 | Assigner VulDB




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
LOW: 3.5CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C
LOW: 3.5CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C
4.0AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:C

Problem types

Cross Site Scripting

Code Injection

Product status

2026.5.29.0
affected

2026.5.29.1
affected

2026.5.29.2
affected

Timeline

2026-07-09:Advisory disclosed
2026-07-09:VulDB entry created
2026-07-09:VulDB entry last update

Credits

Eric-d (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/377247 (VDB-377247 | NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting) vdb-entry technical-description

vuldb.com/vuln/377247/cti (VDB-377247 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/cve/CVE-2026-15311 (CVE-2026-15311 | CVE Analysis and Report) third-party-advisory

vuldb.com/submit/852843 (Submit #852843 | NousResearch hermes-agent 2026.5.29.2 Cross-site Scripting (CWE-79)) third-party-advisory

github.com/NousResearch/hermes-agent/issues/42667 exploit issue-tracking

github.com/NousResearch/hermes-agent/pull/42759 issue-tracking patch

github.com/NousResearch/hermes-agent/ product

cve.org (CVE-2026-15311)

nvd.nist.gov (CVE-2026-15311)

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