CVE-2026-62948
OpenWrt odhcpd/LuCI: unauthenticated DHCPv6 client can inject lease-file lines via FQDN hostname → stored XSS in the LuCI admin UI
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Public exploit
A reference of the record is tagged as an exploit or proof of concept: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.
- https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f (opens in a new tab)x_refsource_CONFIRMexploit
Timeline
ID reserved
By GitHub_M
- 1 day later
· 1 day later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Critical9.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical9.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.58% · top 52% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.6.
Weakness
- CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)All about CWE-79 and its CVEs
- CWE-117: Improper Output Neutralization for Logs (opens in a new tab)All about CWE-117 and its CVEs
- CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences (opens in a new tab)All about CWE-150 and its CVEs
Affected products
References (5)
- https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/openwrt/odhcpd/pull/404 (opens in a new tab)x_refsource_MISC
- https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a (opens in a new tab)x_refsource_MISC
- https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a (opens in a new tab)x_refsource_MISC
- https://github.com/openwrt/openwrt/releases/tag/v25.12.5 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-62948)Record last updated .