# CVE-2020-35849: MantisBT Incorrect Authorization for bug_revision_view_page.php check

> Unprivileged attackers can view private issue summaries and bugnote revisions in MantisBT due to incorrect access checks.

- **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:** Yes
- **Published:** 30 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-7j8m-fm49-xgmg

## What is CVE-2020-35849?

CVE-2020-35849 is a high-severity missing authorization vulnerability in Mantisbt Mantisbt, published on 30 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in MantisBT before 2.24.4. An incorrect access check in bug_revision_view_page.php allows an unprivileged attacker to view the Summary field of private issues, as well as bugnotes revisions, gaining access to potentially confidential information via the bugnote_id parameter.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2020-35849?

2 open source packages ship an affected version, including mantisbt/mantisbt. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mantisbt/mantisbt` | Packagist | All versions | 2.24.4 |
| `mantisbt/mantisbt` | Packagist | All versions | 2.24.4 |

Products: Mantisbt Mantisbt.

## How do I fix CVE-2020-35849?

Upgrade mantisbt/mantisbt to 2.24.4 or later.

## Is CVE-2020-35849 being exploited?

There is no known exploitation of CVE-2020-35849 in the wild and no public exploit code.

## Other vulnerabilities in Mantisbt Mantisbt

- [CVE-2019-15074](https://insights.sbomify.com/CVE-2019-15074/): MantisBT allows cross-site scripting (XSS) via crafted filename (critical 9.6)
- [CVE-2026-30849](https://insights.sbomify.com/CVE-2026-30849/): MantisBT SOAP API has an authentication bypass vulnerability on MySQL (critical 9.3)
- [CVE-2025-47776](https://insights.sbomify.com/CVE-2025-47776/): MantisBT: Authentication bypass for some passwords due to PHP type juggling (high 8.8)
- [CVE-2017-7615](https://insights.sbomify.com/CVE-2017-7615/): MantisBT allows arbitrary password reset (high 8.8)
- [CVE-2026-33517](https://insights.sbomify.com/CVE-2026-33517/): MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35849 and fix it if it is affected.

What it is: CVE-2020-35849 is a high-severity missing authorization vulnerability in Mantisbt Mantisbt, published on 30 Dec 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-2020-35849 in the wild and no public exploit code.

Affected packages and fixed versions:
- mantisbt/mantisbt (Packagist): affected all versions; fixed in 2.24.4
- mantisbt/mantisbt (Packagist): affected all versions; fixed in 2.24.4

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-2020-35849/ (Markdown: https://insights.sbomify.com/CVE-2020-35849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35849
- OSV: https://osv.dev/vulnerability/CVE-2020-35849

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35849/
Summaries are generated and may contain mistakes; the official description above is the record.