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CVE

CVE-2026-62948

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

CVE-2026-62948

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

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 statefileswritestate6() and statefileswritestate4() 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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/openwrt/openwrt/releases/tag/v25.12.5, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62948.json, https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f, https://nvd.nist.gov/vuln/detail/CVE-2026-62948, https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a, https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a, https://github.com/openwrt/odhcpd/pull/404

Severity

9.6

CVSS Score
0
10

Basic Information

Base CVSS
9.6
EPSS Probability
0.0058%
EPSS Percentile
0.45095%
Introduced Version
0
Fix Available
f0a60eee2fe051741c643ea6118718aae1ef17fb

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