# CVE-2026-100698: Adminer before 6.0.2 Privileged-Port SSRF via host_port Regex

> Unauthenticated attackers can bypass privileged-port restrictions to perform Server-Side Request Forgery and internal port scanning via crafted login server strings.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Sep 2026
- **Updated:** 30 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-100698, GHSA-rwxg-xph9-82cj, GHSA-wrf7-8p9h-xp6p, UBUNTU-CVE-2026-100698

## What is CVE-2026-100698?

CVE-2026-100698 is a medium-severity server-side request forgery vulnerability in vrana adminer, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Adminer 5.5.1 through 6.0.1 improperly parses the login 'server' string in the host_port() function in adminer/include/functions.inc.php. The port capture group requires pure digits anchored to the end of the string, so any server value with a non-digit tail fails the regex and falls back to returning the whole string as the host with an empty port. Because the privileged-port restriction in adminer/include/auth.inc.php inspects only the parsed port, the check is skipped, and the mysqli/mysqlnd client subsequently re-parses host:port from the host string and opens a TCP connection. A remote, unauthenticated attacker who can reach the Adminer login page can submit a crafted value such as 127.0.0.1:80/x to make the server initiate TCP connections to arbitrary internal hosts and privileged ports before credentials are validated, enabling server-side request forgery and blind internal port scanning (connection refused vs. handshake vs. timeout acts as a liveness oracle). This is a regression that re-opens the bypass fixed in 5.5.0 (GHSA-58cq-mgw2-38m5). Fixed in 6.0.2.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-100698?


## How do I fix CVE-2026-100698?

Upgrade to a fixed version.

## Is CVE-2026-100698 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100698 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100698 and fix it if it is affected.

What it is: CVE-2026-100698 is a medium-severity server-side request forgery vulnerability in vrana adminer, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100698 exists.

Affected product: vrana adminer. 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-2026-100698/ (Markdown: https://insights.sbomify.com/CVE-2026-100698/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100698
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100698
- OSV: https://osv.dev/vulnerability/CVE-2026-100698

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-100698/
Summaries are generated and may contain mistakes; the official description above is the record.