Vulnerability · CVE-2026-34818
Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /manage/dnsmasq/localdomains/.
Published Apr 2, 2026 · catalog updated Jul 24, 2026 · firewall community
Check if you run it
No confirmed exploitation is on record for CVE-2026-34818. EPSS is 0.24%. Act only if a listed version of firewall community is installed.
Gaps on this record
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium5.1
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.24%
- Remediation
- Advisory link
- Affected products
- cpe endian/firewall community
Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /manage/dnsmasq/localdomains/. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe endian/firewall communityversion unspecified
How to fix CVE-2026-34818
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-34818. EPSS is 0.24%. Act only if a listed version of firewall community is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-79: Cross-site Scripting (XSS). EPSS 0.24%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Apr 2, 2026 · NIST NVD
Detected
Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /manage/dnsmasq/localdomains/. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
Jul 24, 2026 · NIST NVD
Updated
Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /manage/dnsmasq/localdomains/. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
Sources
- CVE.orgVulnerability recordCVE-2026-34818
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-34818
30-day exploitation probability 0.2%
first.org - NIST NVDVulnerability recordCVE-2026-34818
Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /manage/dnsmasq/localdomains/. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.