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CVE-2026-62948— OpenWrt odhcpd/LuCI: unauthenticated DHCPv6 client can inject lease-file lines via FQDN hostname → stored XSS in the LuCI admin UI

Quick assessment

Affected
openwrt openwrt
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenWrt是OpenWRT社区开源的一套针对嵌入式设备的Linux操作系统。 OpenWrt 25.12.5之前版本存在安全漏洞，该漏洞源于odhcpd在将DHCPv6客户端FQDN选项39的主机名写入/tmp/odhcpd.leases时未进行转义，导致可在管理员页面的Active DHCPv6 Leases中注入伪造的租赁行，从而造成跨站脚本攻击。

CVSS 9.6 · Critical EPSS 0.58% · P46

Affected Version Matrix 1

VendorProduct Version RangeStatus
openwrt openwrt < 25.12.5 affected
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I. Basic Information for CVE-2026-62948

Vulnerability Information
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Vulnerability Title
OpenWrt odhcpd/LuCI: unauthenticated DHCPv6 client can inject lease-file lines via FQDN hostname → stored XSS in the LuCI admin UI
Source: CVE Program / CVE List V5
Vulnerability Description
OpenWrt is a Linux operating system targeting embedded devices. Prior to 25.12.5, odhcpd writes a DHCPv6 client FQDN option 39 hostname into /tmp/odhcpd.leases through src/statefiles.c statefiles_write_state6() and statefiles_write_state4() without escaping, allowing newline injection of forged lease lines that LuCI rpcd-mod-luci getDHCPLeases displays through htdocs/luci-static/resources/view/status/include/40_dhcp.js and htdocs/luci-static/resources/luci.js dom.append as live HTML in the Active DHCPv6 Leases admin page. This vulnerability is fixed in 25.12.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenWrt 输出处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenWrt是OpenWRT社区开源的一套针对嵌入式设备的Linux操作系统。 OpenWrt 25.12.5之前版本存在安全漏洞，该漏洞源于odhcpd在将DHCPv6客户端FQDN选项39的主机名写入/tmp/odhcpd.leases时未进行转义，导致可在管理员页面的Active DHCPv6 Leases中注入伪造的租赁行，从而造成跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openwrt openwrt < 25.12.5 -

II. Public POCs for CVE-2026-62948

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10514 chars
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III. Intelligence Information for CVE-2026-62948

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Patches & Fixes for CVE-2026-62948 (3)

Vendor Advisories for CVE-2026-62948 (1)

Vendor Pages for CVE-2026-62948 (1)

IV. Related Vulnerabilities

Same product: openwrt
Same vendor: openwrt
Same weakness: CWE-79

V. Comments for CVE-2026-62948

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