CVE-2023-34354Public exploitNetwork attack vector

Stored JavaScript execution via incomplete branding escaping

Published Oct 11, 2023 · Updated Nov 4, 2025

Stored XSS in Peplink Surf SOHO HW1 6.3.5 allows remote authenticated users to execute JavaScript in another user's browser. The handle_brand_upload function stores brand_web_name and web_link_url in /etc/brand.conf, and load_leftmenu inserts them into HTML after JavaScript-only escaping. Exploitation requires write privileges, mode=api, a VISLINK OEM build, and a victim who loads the branded interface; script runs in that browser.

CVSS severity3.4
Low
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Peplink Surf SOHO HW1 6.3.5 allows remote authenticated users to execute JavaScript in another user's browser. The handle_brand_upload function stores brand_web_name and web_link_url in /etc/brand.conf, and load_leftmenu inserts them into HTML after JavaScript-only escaping. Exploitation requires write privileges, mode=api, a VISLINK OEM build, and a victim who loads the branded interface; script runs in that browser.

The record

CVE
CVE-2023-34354
Published
Oct 11, 2023
Updated
Nov 4, 2025
Vendor
Peplink
Product
Surf SOHO MK3
Classifications
CWE-80, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=v6.3.5 (in QEMU)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Peplink · Surf SOHO MK3version=v6.3.5 (in QEMU)
Peplink · Pepwave Surf SOHOversion=6.3.5

Published CVSS scores

3.4Cisco TalosCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1203Exploitation for Client Execution

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo