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TI-2020-16205 Aliases CVE-2020-26574GHSA-fgqf-9xqq-px3h

Leostream Connection Broker 8.2.x is affected by stored XSS.

Priority MEDIUM 45CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

Leostream Connection Broker 8.2.x is affected by stored XSS. An unauthenticated attacker can inject arbitrary JavaScript code via the webquery.pl User-Agent HTTP header. It is rendered by the admins the next time they log in. The JavaScript injected can be used to force the admin to upload a malicious Perl script that will be executed as root via libMisc::browser_client. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Why it matters now

EPSS 0.02119 81st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:leostream:connection_broker:*:*:*:*:*:*:*:*8.2.15 – 8.2.73VulnerableLeostream
  • cpe:2.3:a:leostream:connection_broker:*:*:*:*:*:*:*:* Versions 8.2.15 – 8.2.73 Vulnerable ·Leostream

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-26574
  2. 2026-10-03 Alias added: GHSA-fgqf-9xqq-px3h

References

Exploit 1

Advisory 1

  • TI-2021-15837 LeoStream Connection Broker 9.x before 9.0.34.3 allows Unauthenticated Reflected XSS via… CVSS 3.1MEDIUM 6.1
  • TI-2018-13327 The Leostream Agent before Build 7.0.1.0 when used with Leostream Connection Broker… CVSS 3.0HIGH 7.5
  • TI-2021-18287 Leostream Connection Broker 9.0.40.17 allows administrator to upload and execute Perl code. CVSS 3.1HIGH 7.2
  • TI-2021-18288 Leostream Connection Broker 9.0.40.17 allows administrators to conduct directory… CVSS 3.1MEDIUM 4.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences