CVE-2026-1698: HTTP Host header vulnerability in WebClient and WebScheduler web apps

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-26 · updated 2026-07-09
Weakness: CWE-644

Description

A HTTP Host header attack vulnerability affects WebClient and the WebScheduler web apps of PcVue in version 15.0.0 through 16.3.3 included, allowing a remote attacker to inject harmful payloads that manipulate server-side behavior. This vulnerability only affects the endpoints /Authentication/ExternalLogin, /Authentication/AuthorizationCodeCallback and /Authentication/Logout of the WebClient and WebScheduler web apps.

Affected products

arcinfo PcVue: from 15.0.0 through 15.2.13; from 16.0.0 before 16.3.4 — fixed in 16.3.4

How to fix

Upgrade to a fixed version: arcinfo PcVue 16.3.4. Check the vendor advisory for mitigations.

References

https://www.pcvue.com/security/#SB2026-2

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