CVE-2026-34491

highpriority · track · 0EPSS 0.004 · 34 %ileUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.40% (34th) EPSS

CVSS 8 · high

Is it mine?

8 products

Check your exposure

Who says so?

1 sources

cisa_csaf_ot

EPSS · scored 2026-10-27

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Johnson Controls Metasys 14 and Johnson Controls Metasys 15 allows Cross Site Scripting. This issue affects Metasys 14: before 14.1.5; Metasys 15: before 15.0.1.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedMetasys 12cisa_csaf_ot
Metasys 12: End of support, update to later version
FixedMetasys 13cisa_csaf_ot
Metasys 13: End of support, update to later version
FixedMetasys 14cisa_csaf_ot
Metasys 14.1.5: Forecast release 2026-07-15
FixedMetasys 15cisa_csaf_ot
Metasys 15.0: Patch released 2026-03-25
MitigationMetasys 12cisa_csaf_ot
Educate users to avoid clicking on untrusted or unexpected links that target the Metasys UI
MitigationMetasys 13cisa_csaf_ot
Educate users to avoid clicking on untrusted or unexpected links that target the Metasys UI
MitigationMetasys 14cisa_csaf_ot
Educate users to avoid clicking on untrusted or unexpected links that target the Metasys UI
MitigationMetasys 15cisa_csaf_ot
Educate users to avoid clicking on untrusted or unexpected links that target the Metasys UI

cvss

Technical severity, 0–10. One row per scoring source.

8.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.1–8

v3.18highCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Hsecondary · CISA US

v4.06.1mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/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:Xsecondary · productsecurity@jci.com

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USCWE-79US

affected products (8)

Products and version ranges known to be affected.

Johnson Controls Inc Metasys 12: vers:all/*all versionscisa_csaf_otUS
Johnson Controls Inc Metasys 13: vers:all/*all versionscisa_csaf_otUS
Johnson Controls Inc Metasys 14: <v14.1.5all versionscisa_csaf_otUS
Johnson Controls Inc Metasys 15: <v15.0.1all versionscisa_csaf_otUS
Johnson Controls Inc Metasys 12≤ vers:all/*cisa_csaf_otUS
Johnson Controls Inc Metasys 13≤ vers:all/*cisa_csaf_otUS
Johnson Controls Inc Metasys 14< v14.1.5cisa_csaf_otUS
Johnson Controls Inc Metasys 15< v15.0.1cisa_csaf_otUS

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-26-225-14Johnson Controls Metasys2026-08-13icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could allow a low-privilege user or attacker to inject a persistent malicious payload via a crafted URL that executes in the context of other users' sessions, including administrators, potentially leading to session hijacking and unauthorized access.

sources

Which sources assert this record, and when.

cisa_csaf_ot NVD CVE.org MITRE

published 2026-08-24modified 2026-09-03

references (1) nvd

External citations — patches, advisories, analysis.

https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories

scry

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