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

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Summary

CVECVE-2026-15311
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 00:16:32 UTC
Updated2026-07-10 15:43:30 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 2 LOW from [email protected]

CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.002030000 probability, percentile 0.103410000 (date 2026-07-13)

Problem Types: CWE-79 | CWE-94 | CWE-79 Cross Site Scripting | CWE-94 Code Injection

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2LOWCVSS: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/C...
4.0CNADECLARED5.1MEDIUMCVSS: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
3.1[email protected]Secondary3.5LOWCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.1CNADECLARED3.5LOWCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C
3.0CNADECLARED3.5LOWCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C
2.0[email protected]Secondary4AV:N/AC:L/Au:S/C:N/I:P/A:N
2.0CNADECLARED4AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:C

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
Passive
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA NousResearch Hermes-agent affected 2026.5.29.0 Not specified
CNA NousResearch Hermes-agent affected 2026.5.29.1 Not specified
CNA NousResearch Hermes-agent affected 2026.5.29.2 Not specified

References

ReferenceSourceLinkTags
vuldb.com/vuln/377247 [email protected] vuldb.com
github.com/NousResearch/hermes-agent/pull/42759 [email protected] github.com
vuldb.com/submit/852843 [email protected] vuldb.com
github.com/NousResearch/hermes-agent [email protected] github.com
vuldb.com/cve/CVE-2026-15311 [email protected] vuldb.com
vuldb.com/vuln/377247/cti [email protected] vuldb.com
github.com/NousResearch/hermes-agent/issues/42667 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Eric-d (VulDB User) (en)

CNA: VulDB CNA Team (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-09T00:00:00.000ZAdvisory disclosed
CNA2026-07-09T02:00:00.000ZVulDB entry created
CNA2026-07-09T19:54:35.000ZVulDB entry last update
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