# CVE-2026-62948: Cross-site scripting in openwrt

> Unauthenticated DHCPv6 clients can inject malicious HTML into lease files, leading to stored XSS in the LuCI admin interface.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Jul 2026
- **Updated:** 15 Jul 2026
- **Also known as:** GHSA-hhmc-92hw-535f

## What is CVE-2026-62948?

CVE-2026-62948 is a critical cross-site scripting vulnerability in Openwrt Openwrt, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-150 (Improper Neutralization of Escape, Meta, or Control Sequences), CWE-117 (Improper Output Neutralization for Logs)

## Which versions are affected by CVE-2026-62948?

It affects 1 product.


Products: Openwrt Openwrt.

## How do I fix CVE-2026-62948?

No fix has been published for CVE-2026-62948 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-62948 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62948 exists.

## Other vulnerabilities in Openwrt Openwrt

- [CVE-2020-28951](https://insights.sbomify.com/CVE-2020-28951/): Use after free in n/a (critical 9.8)
- [CVE-2026-30871](https://insights.sbomify.com/CVE-2026-30871/): OpenWrt Project has Stack-based Buffer Overflow in DNS PTR Query (critical 9.5)
- [CVE-2026-30872](https://insights.sbomify.com/CVE-2026-30872/): OpenWrt Project has a Stack-based Buffer Overflow vulnerability via IPv6 reverse DNS lookup (critical 9.5)
- [CVE-2021-28961](https://insights.sbomify.com/CVE-2021-28961/): Command injection in n/a (high 8.8)
- [CVE-2019-17367](https://insights.sbomify.com/CVE-2019-17367/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-62948 and fix it if it is affected.

What it is: CVE-2026-62948 is a critical cross-site scripting vulnerability in Openwrt Openwrt, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62948 exists.

Affected product: Openwrt Openwrt. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-62948/ (Markdown: https://insights.sbomify.com/CVE-2026-62948/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-62948
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-62948
- OSV: https://osv.dev/vulnerability/CVE-2026-62948

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-62948/
Summaries are generated and may contain mistakes; the official description above is the record.