# CVE-2023-49277: Reflected Cross-site Scripting Vulnerability in dpaste

> Attackers can execute arbitrary JavaScript in user browsers via the expires parameter, leading to data theft or unauthorized access.

- **Severity:** High 8.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H`)
- **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:** 1 Dec 2023
- **Updated:** 11 Oct 2024
- **Also known as:** GHSA-r8j9-5cj7-cv39, PYSEC-2026-1317

## What is CVE-2023-49277?

CVE-2023-49277 is a high-severity cross-site scripting vulnerability in DarrenOfficial dpaste, published on 1 Dec 2023. 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

dpaste is an open source pastebin application written in Python using the Django framework. A security vulnerability has been identified in the expires parameter of the dpaste API, allowing for a POST Reflected XSS attack. This vulnerability can be exploited by an attacker to execute arbitrary JavaScript code in the context of a user's browser, potentially leading to unauthorized access, data theft, or other malicious activities. Users are strongly advised to upgrade to dpaste release v3.8 or later versions, as dpaste versions older than v3.8 are susceptible to the identified security vulnerability. No known workarounds have been identified, and applying the patch is the most effective way to remediate the vulnerability.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2023-49277?

3 open source packages ship an affected version, including dpaste and Dpaste. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `dpaste` | PyPI | All versions | 3.8 |
| `dpaste` | PyPI | All versions | 3.8 |
| `Dpaste` | PyPI | All versions | 3.8 |

Products: Darrennathanael Dpaste.

## How do I fix CVE-2023-49277?

Upgrade dpaste to 3.8 or later.

## Is CVE-2023-49277 being exploited?

There is no known exploitation of CVE-2023-49277 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-49277 and fix it if it is affected.

What it is: CVE-2023-49277 is a high-severity cross-site scripting vulnerability in DarrenOfficial dpaste, published on 1 Dec 2023. 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-2023-49277 in the wild and no public exploit code.

Affected packages and fixed versions:
- dpaste (PyPI): affected all versions; fixed in 3.8
- dpaste (PyPI): affected all versions; fixed in 3.8
- Dpaste (PyPI): affected all versions; fixed in 3.8

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-2023-49277/ (Markdown: https://insights.sbomify.com/CVE-2023-49277/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-49277
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-49277
- OSV: https://osv.dev/vulnerability/CVE-2023-49277

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-49277/
Summaries are generated and may contain mistakes; the official description above is the record.