CVE-2025-65289Public exploit

Admin-session theft via unescaped DHCP hostnames

Published Dec 9, 2025 · Updated Dec 10, 2025

Stored XSS in Mercury MR816v2 firmware 081C3114 4.8.7 Build 110427 Rel 36550n allows remote attackers on the LAN to steal admin sessions. The DHCP service stores a client-supplied hostname, and the management UI inserts it into the device list without HTML encoding, causing embedded JavaScript to execute in the administrator’s browser. The required gate is LAN access plus an active administrator session; the script then operates under the management origin to exfiltrate session material or issue administrative requests.

CVSS severity6.1
Medium
EPSS probability0.32%
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 Mercury MR816v2 firmware 081C3114 4.8.7 Build 110427 Rel 36550n allows remote attackers on the LAN to steal admin sessions. The DHCP service stores a client-supplied hostname, and the management UI inserts it into the device list without HTML encoding, causing embedded JavaScript to execute in the administrator’s browser. The required gate is LAN access plus an active administrator session; the script then operates under the management origin to exfiltrate session material or issue administrative requests.

The record

CVE
CVE-2025-65289
Published
Dec 9, 2025
Updated
Dec 10, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
6.1NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

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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