# CVE-2026-93635: Zimbra Collaboration Suite LDAP Filter Injection via Unescaped computeDn() Template Substitution

> Unauthenticated attackers can inject LDAP filters to bypass authentication or read sensitive directory data in Zimbra Collaboration Suite.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **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:** 16 Oct 2026
- **Also known as:** GHSA-fqwq-55mh-xc85

## What is CVE-2026-93635?

CVE-2026-93635 is a medium-severity vulnerability in Zimbra Collaboration Suite, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

LDAP filter injection in Zimbra Collaboration Suite 10.1.0 through 10.1.21 allows unauthenticated attackers to alter external LDAP search filters. On domains using search-filter authentication and lazy provisioning, this creates a password oracle for external directory users. Authenticated S/MIME lookups can also return certificates and identity data for unintended directory entries.

Weakness: CWE-90 (Improper Neutralization of Special Elements used in an LDAP Query)

## Which versions are affected by CVE-2026-93635?


## How do I fix CVE-2026-93635?

No fix has been published for CVE-2026-93635 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93635 being exploited?

There is no known exploitation of CVE-2026-93635 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93635 and fix it if it is affected.

What it is: CVE-2026-93635 is a medium-severity vulnerability in Zimbra Collaboration Suite, 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-2026-93635 in the wild and no public exploit code.

Affected product: Zimbra Collaboration Suite. 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-2026-93635/ (Markdown: https://insights.sbomify.com/CVE-2026-93635/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93635
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93635
- OSV: https://osv.dev/vulnerability/CVE-2026-93635

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93635/
Summaries are generated and may contain mistakes; the official description above is the record.