CVE-2026-34802Network attack vector

Authenticated cross-user script execution via stored remark

Published Apr 2, 2026 · Updated Apr 2, 2026

Stored XSS in /cgi-bin/salearn.cgi in Endian Firewall 3.3.25 and earlier allows remote authenticated users to run JavaScript in other users' browsers. The CGI handler stores the unneutralized remark user ham spam parameter and later renders it into the affected page, causing browsers to interpret the value as script. An authenticated account can plant the payload; execution requires another user to view the page, exposing that user's browser session to script-driven data access or actions.

CVSS severity5.1
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in /cgi-bin/salearn.cgi in Endian Firewall 3.3.25 and earlier allows remote authenticated users to run JavaScript in other users' browsers. The CGI handler stores the unneutralized remark user ham spam parameter and later renders it into the affected page, causing browsers to interpret the value as script. An authenticated account can plant the payload; execution requires another user to view the page, exposing that user's browser session to script-driven data access or actions.

The record

CVE
CVE-2026-34802
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Endian
Product
Endian Firewall
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=3.3.25

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Endian · Endian Firewallversion=3.3.25

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
6.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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