# CVE-2023-48308: Calendar app returns full stacktrace when an error happens while editing appointment

> An attacker can obtain server stack traces and internal paths by triggering an error while editing a calendar appointment in the Nextcloud Calendar app.

- **Severity:** Low 3.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 21 Dec 2023
- **Updated:** 27 Nov 2024
- **Also known as:** GHSA-fv3c-qvjr-5rv8

## What is CVE-2023-48308?

CVE-2023-48308 is a low-severity vulnerability in nextcloud security-advisories, published on 21 Dec 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Nextcloud/Cloud is a calendar app for Nextcloud. An attacker can gain access to stacktrace and internal paths of the server when generating an exception while editing a calendar appointment. It is recommended that the Nextcloud Calendar app is upgraded to 4.5.3

Weakness: CWE-212 (Improper Removal of Sensitive Information Before Storage or Transfer), CWE-1258 (Exposure of Sensitive System Information Due to Uncleared Debug Information)

## Which versions are affected by CVE-2023-48308?

It affects 1 product.


Products: Nextcloud Calendar.

## How do I fix CVE-2023-48308?

No fix has been published for CVE-2023-48308 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-48308 being exploited?

There is no known exploitation of CVE-2023-48308 in the wild and no public exploit code.

## Other vulnerabilities in nextcloud security-advisories

- [CVE-2025-66550](https://insights.sbomify.com/CVE-2025-66550/): Nextcloud Calendar attachments of local files are offered to downloaded (medium 5.7)
- [CVE-2022-24838](https://insights.sbomify.com/CVE-2022-24838/): Command Injection in Appointment Emails for Nextcloud Calendar (medium 5.3)
- [CVE-2025-66511](https://insights.sbomify.com/CVE-2025-66511/): Nextcloud Calendar app used predictable proposal participant tokens (medium 4.8)
- [CVE-2018-3763](https://insights.sbomify.com/CVE-2018-3763/): Cross-site scripting in Nextcloud Calendar application (medium 4.8)
- [CVE-2024-37316](https://insights.sbomify.com/CVE-2024-37316/): Nextcloud Calendar's event create can create attachments that link to other websites (medium 4.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-48308 and fix it if it is affected.

What it is: CVE-2023-48308 is a low-severity vulnerability in nextcloud security-advisories, published on 21 Dec 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-48308 in the wild and no public exploit code.

Affected product: nextcloud security-advisories. 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-2023-48308/ (Markdown: https://insights.sbomify.com/CVE-2023-48308/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-48308
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-48308
- OSV: https://osv.dev/vulnerability/CVE-2023-48308

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-48308/
Summaries are generated and may contain mistakes; the official description above is the record.