CVE-2026-62948
OpenWrt odhcpd/LuCI: unauthenticated DHCPv6 client can inject lease-file lines via FQDN hostname → stored XSS in the LuCI admin UI
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.
INFO
Published Date :
July 15, 2026, 6:16 p.m.
Last Modified :
July 21, 2026, 4:06 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE |
Solution
- Update OpenWrt to version 25.12.5 or newer.
- Verify the update is applied successfully.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-62948.
| URL | Resource |
|---|---|
| https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a | Patch |
| https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a | Patch |
| https://github.com/openwrt/odhcpd/pull/404 | Issue Tracking Patch |
| https://github.com/openwrt/openwrt/releases/tag/v25.12.5 | Release Notes |
| https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f | Exploit Mitigation Vendor Advisory |
| https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-62948 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-62948
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-62948 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-62948 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:openwrt:openwrt:*:*:*:*:*:*:*:* versions up to (excluding) 25.12.5 Added Reference Type GitHub, Inc.: https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a Types: Patch Added Reference Type GitHub, Inc.: https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a Types: Patch Added Reference Type GitHub, Inc.: https://github.com/openwrt/odhcpd/pull/404 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/openwrt/openwrt/releases/tag/v25.12.5 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f Types: Exploit, Mitigation, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 15, 2026
Action Type Old Value New Value Added Reference https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f Added SSVC {'id': 'CVE-2026-62948', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-15T18:08:14.354771Z'} -
New CVE Received by [email protected]
Jul. 15, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'openwrt', 'product': 'openwrt', 'versions': [{'status': 'affected', 'version': '< 25.12.5'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Added CWE CWE-79 Added CWE CWE-117 Added CWE CWE-150 Added Reference https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a Added Reference https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a Added Reference https://github.com/openwrt/odhcpd/pull/404 Added Reference https://github.com/openwrt/openwrt/releases/tag/v25.12.5 Added Reference https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f