# CVE-2020-27739: Auth bypass in n/a

> Unauthenticated attackers can hijack sessions of recently logged-in users in Citadel WebCit, leading to account takeover.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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:** 28 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-f928-h33x-jm46, UBUNTU-CVE-2020-27739

## What is CVE-2020-27739?

CVE-2020-27739 is a critical authentication bypass vulnerability in n/a, published on 28 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A Weak Session Management vulnerability in Citadel WebCit through 926 allows unauthenticated remote attackers to hijack recently logged-in users' sessions. NOTE: this was reported to the vendor in a publicly archived "Multiple Security Vulnerabilities in WebCit 926" thread.

Weakness: CWE-613 (DEPRECATED: Insufficient Session Expiration)

## Which versions are affected by CVE-2020-27739?

It affects 1 product.


Products: Citadel Webcit.

## How do I fix CVE-2020-27739?

No fix has been published for CVE-2020-27739 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27739 being exploited?

There is no known exploitation of CVE-2020-27739 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2009-0364](https://insights.sbomify.com/CVE-2009-0364/): Other in n/a (high 7.5)
- [CVE-2007-3821](https://insights.sbomify.com/CVE-2007-3821/): Cross-site request forgery in n/a (high 7.5)
- [CVE-2020-27742](https://insights.sbomify.com/CVE-2020-27742/): Information disclosure in n/a (medium 6.5)
- [CVE-2020-27741](https://insights.sbomify.com/CVE-2020-27741/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2020-29547](https://insights.sbomify.com/CVE-2020-29547/): Other in n/a (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27739 and fix it if it is affected.

What it is: CVE-2020-27739 is a critical authentication bypass vulnerability in n/a, published on 28 Oct 2020. 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-2020-27739 in the wild and no public exploit code.

Affected product: n/a. 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-2020-27739/ (Markdown: https://insights.sbomify.com/CVE-2020-27739/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27739
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27739
- OSV: https://osv.dev/vulnerability/CVE-2020-27739

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27739/
Summaries are generated and may contain mistakes; the official description above is the record.