Security readout for executives and security teams
Plain-English summary
A malicious device on a network could plant data that OpenWrt later shows inside the LuCI admin interface as active content. An administrator viewing DHCPv6 leases could trigger the stored XSS. The issue is rated critical and fixed in OpenWrt 25.12.5.
Executive priority
Treat this as urgent for OpenWrt infrastructure with LuCI enabled or untrusted local network clients. The required admin interaction lowers immediacy compared with fully automatic compromise, but successful XSS can affect confidentiality, integrity, and availability.
Technical view
Before 25.12.5, odhcpd wrote DHCPv6 FQDN option 39 hostnames into lease state files without escaping. Newline injection could create forged lease entries, which LuCI rendered as live HTML in the Active DHCPv6 Leases page, producing stored XSS.
Likely exposure
OpenWrt routers and embedded devices running versions before 25.12.5 are potentially affected. Highest concern is on systems where untrusted DHCPv6 clients can interact with odhcpd and administrators use the LuCI web interface.
Exploitation context
The source bundle marks KEV as false and provides no evidence of active exploitation. The documented path requires unauthenticated DHCPv6 client input plus administrator interaction with the LuCI DHCPv6 leases view.
Researcher notes
The evidence points to a chained data-handling issue: insufficient output escaping in odhcpd lease serialization and unsafe LuCI rendering. The bundle cites fixes in both odhcpd and LuCI, but does not provide exploit-in-the-wild evidence.
Mitigation direction
- Upgrade OpenWrt to 25.12.5 or later.
- Prioritize devices exposed to untrusted or guest DHCPv6 clients.
- Restrict LuCI access to trusted management networks.
- Review OpenWrt advisory and release notes for device-specific guidance.
- Avoid viewing DHCPv6 leases on unpatched systems unless necessary.
Validation and detection
- Inventory OpenWrt devices and confirm installed version.
- Identify systems running OpenWrt earlier than 25.12.5.
- Confirm whether LuCI is installed and used for administration.
- Review DHCPv6 exposure to guest, user, or untrusted networks.
- Verify remediation by confirming OpenWrt 25.12.5 or later.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-117: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-150: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-62948 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H2.86GitHub_MVulnerability scoring details
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535fCVE reference, GitHub_M · x_refsource_CONFIRM
- https://github.com/openwrt/odhcpd/pull/404CVE reference, GitHub_M · x_refsource_MISC
- https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048aCVE reference, GitHub_M · x_refsource_MISC
- https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3aCVE reference, GitHub_M · x_refsource_MISC
- https://github.com/openwrt/openwrt/releases/tag/v25.12.5CVE reference, GitHub_M · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.