# CVE-2026-55572: e107: SQL injection in alt_auth plugin (otherdb / e107db backends) via login username

> Unauthenticated attackers can inject SQL via login username in e107 alt_auth plugin if external database backends are configured, exposing or modifying data.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 14 Oct 2026
- **Updated:** 29 Oct 2026
- **Also known as:** GHSA-5f75-c25x-59wx

## What is CVE-2026-55572?

CVE-2026-55572 is a critical SQL injection vulnerability in e107inc e107, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

e107 is a content management system (CMS). Prior to 2.3.7, the bundled alt_auth plugin's otherdb and e107db authentication backends interpolate the submitted login username directly into SQL in e107_plugins/alt_auth/otherdb_auth.php and e107_plugins/alt_auth/e107db_auth.php. The login() methods execute those strings with PDO::query() before effective sanitization, so an unauthenticated user can inject SQL when alt_auth is installed and either backend is configured with a live external database connection. The injection can expose or modify data available to the configured database account, and query failures can additionally disclose the generated query through the debug-message path. This issue is fixed in version 2.3.7.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2026-55572?


## How do I fix CVE-2026-55572?

No fix has been published for CVE-2026-55572 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-55572 being exploited?

There is no known exploitation of CVE-2026-55572 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-55572 and fix it if it is affected.

What it is: CVE-2026-55572 is a critical SQL injection vulnerability in e107inc e107, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-55572 in the wild and no public exploit code.

Affected product: e107inc e107. 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-2026-55572/ (Markdown: https://insights.sbomify.com/CVE-2026-55572/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-55572
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-55572
- OSV: https://osv.dev/vulnerability/CVE-2026-55572

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-55572/
Summaries are generated and may contain mistakes; the official description above is the record.