CVE-2026-1698Network attack vector

Authentication-flow manipulation via trusted Host header

Published Feb 26, 2026 · Updated Feb 26, 2026

HTTP Host header injection in PcVue 15.0.0 through 16.3.3 allows remote attackers to manipulate authentication-flow behavior. WebClient and WebScheduler trust attacker-controlled Host values at three authentication endpoints; the resulting server operation is undisclosed. No authentication is required, but a user must passively interact with the affected flow before attacker-supplied routing data can influence it.

CVSS severity5.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP Host header injection in PcVue 15.0.0 through 16.3.3 allows remote attackers to manipulate authentication-flow behavior. WebClient and WebScheduler trust attacker-controlled Host values at three authentication endpoints; the resulting server operation is undisclosed. No authentication is required, but a user must passively interact with the affected flow before attacker-supplied routing data can influence it.

The record

CVE
CVE-2026-1698
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
ARC Informatique
Product
PcVue
Classifications
CWE-644
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15.0.0 <=15.2.13
  2. Affected versionversion=16.0.0 <=16.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ARC Informatique · PcVueversion=15.0.0 <=15.2.13; version=16.0.0 <=16.3.3

Published CVSS scores

5.3ARC InformatiqueCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:L/SI:L/SA:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-644Improper Neutralization of HTTP Headers for Scripting Syntax

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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