Browser script execution via stored dscp input
Published Apr 2, 2026 · Updated Apr 2, 2026
Stored XSS in Endian Firewall 3.3.25 and earlier allows remote authenticated users to run JavaScript in another user's browser. The /manage/qos/rules/ handler stores the unneutralized dscp parameter and inserts it into the QoS rules page, where a later page view executes it. An authenticated account is required to plant the payload, and execution requires another user to view the affected page; reported impact is limited to that user's browser context.
Summary
What happened
Stored XSS in Endian Firewall 3.3.25 and earlier allows remote authenticated users to run JavaScript in another user's browser. The /manage/qos/rules/ handler stores the unneutralized dscp parameter and inserts it into the QoS rules page, where a later page view executes it. An authenticated account is required to plant the payload, and execution requires another user to view the affected page; reported impact is limited to that user's browser context.
The record
- CVE
- CVE-2026-34804
- Published
- Apr 2, 2026
- Updated
- Apr 2, 2026
- Vendor
- Endian
- Product
- Endian Firewall
- Classifications
- CWE-79
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 2, 2026CVE publishedPublication date reported by the CVE source.
- 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?
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- Affected versionversion=3.3.25
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
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Your stack
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