CVE-2020-26574

CRITICAL
9.6
CVSS Score
Published: October 6, 2020 at 02:32 PM UTC
Updated: June 17, 2026 at 03:08 AM UTC
1 product affected across 1 vendorConnection Broker

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Severity
CRITICAL9.6
Exploit prediction
EPSS 2%

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

8.2.15 ≤ v ≤ 8.2.73

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

x_refsource_MISCExploitThird Party Advisory
https://adepts.of0x.cc/leostream-xss-to-rce/
x_refsource_MISCRelease NotesVendor Advisory
https://www.leostream.com/resources/product-lifecycle/

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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