# CVE-2021-31745: Auth bypass in n/a

> Attackers can maintain unauthorized access to Pluck CMS after password changes due to lack of session invalidation, requiring administrators to patch the application.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:** 10 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-prm5-542j-m494

## What is CVE-2021-31745?

CVE-2021-31745 is a high-severity authentication bypass vulnerability in n/a, published on 10 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Session Fixation vulnerability in login.php in Pluck-CMS Pluck 4.7.15 allows an attacker to sustain unauthorized access to the platform. Because Pluck does not invalidate prior sessions after a password change, access can be sustained even after an administrator performs regular remediation attempts such as resetting their password.

Weakness: CWE-384 (Session Fixation)

## Which versions are affected by CVE-2021-31745?

It affects 1 product.


Products: Pluck-Cms Pluck.

## How do I fix CVE-2021-31745?

No fix has been published for CVE-2021-31745 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-31745 being exploited?

There is no known exploitation of CVE-2021-31745 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-43042](https://insights.sbomify.com/CVE-2024-43042/): Security feature bypass in n/a (critical 9.8)
- [CVE-2021-31746](https://insights.sbomify.com/CVE-2021-31746/): Path traversal in n/a (critical 9.8)
- [CVE-2020-20951](https://insights.sbomify.com/CVE-2020-20951/): Command injection in n/a (critical 9.8)
- [CVE-2019-11344](https://insights.sbomify.com/CVE-2019-11344/): File upload in n/a (critical 9.8)
- [CVE-2018-11736](https://insights.sbomify.com/CVE-2018-11736/): File upload in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31745 and fix it if it is affected.

What it is: CVE-2021-31745 is a high-severity authentication bypass vulnerability in n/a, published on 10 Dec 2021. 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-2021-31745 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-2021-31745/ (Markdown: https://insights.sbomify.com/CVE-2021-31745/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31745
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31745
- OSV: https://osv.dev/vulnerability/CVE-2021-31745

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31745/
Summaries are generated and may contain mistakes; the official description above is the record.