# CVE-2010-4764: Security feature bypass in n/a

> Attackers can spoof encrypted emails using revoked keys because OTRS fails to warn users, bypassing security checks.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:P/A:N`)
- **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:** Yes
- **Published:** 18 Mar 2011
- **Updated:** 16 Sep 2024
- **Also known as:** DEBIAN-CVE-2010-4764, GHSA-6gv9-qq2x-7jw6

## What is CVE-2010-4764?

CVE-2010-4764 is a medium-severity vulnerability in Otrs Otrs, published on 18 Mar 2011. 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

Open Ticket Request System (OTRS) before 2.4.10, and 3.x before 3.0.3, does not present warnings about incoming encrypted e-mail messages that were based on revoked PGP or GPG keys, which makes it easier for remote attackers to spoof e-mail communication by leveraging a key that has a revocation signature.

Weakness: CWE-255

## Which versions are affected by CVE-2010-4764?

It affects 1 product.


Products: Otrs Otrs.

## How do I fix CVE-2010-4764?

Upgrade to a fixed version.

## Is CVE-2010-4764 being exploited?

There is no known exploitation of CVE-2010-4764 in the wild and no public exploit code.

## Other vulnerabilities in Otrs Otrs

- [CVE-2026-48188](https://insights.sbomify.com/CVE-2026-48188/): SQL Injection via MySQL Quote Method (critical 9.1)
- [CVE-2013-4717](https://insights.sbomify.com/CVE-2013-4717/): SQL injection in n/a (high 8.8)
- [CVE-2017-14635](https://insights.sbomify.com/CVE-2017-14635/): Code injection in n/a (high 8.8)
- [CVE-2023-5422](https://insights.sbomify.com/CVE-2023-5422/): SSL Certificates are not checked for E-Mail Handling (high 8.7)
- [CVE-2023-6254](https://insights.sbomify.com/CVE-2023-6254/): Password is send back to client (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2010-4764 and fix it if it is affected.

What it is: CVE-2010-4764 is a medium-severity vulnerability in Otrs Otrs, published on 18 Mar 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2010-4764 in the wild and no public exploit code.

Affected product: Otrs Otrs. 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-2010-4764/ (Markdown: https://insights.sbomify.com/CVE-2010-4764/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2010-4764
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-4764
- OSV: https://osv.dev/vulnerability/CVE-2010-4764

---
From sbomify Insights: https://insights.sbomify.com/CVE-2010-4764/
Summaries are generated and may contain mistakes; the official description above is the record.