medium5.3
CVE-2026-33209
Avo has a XSS vulnerability on `return_to` param
Impact
## Description A reflected cross-site scripting (XSS) vulnerability exists in the `return_to` query parameter used in the avo interface. An attacker can craft a malicious URL that injects arbitrary JavaScript, which is executed when he clicks a dynamically generated navigation button. ## Impact This vulnerability may allow execution of arbitrary JavaScript in the context of the application. Impact varies depending on deployment: - In unauthenticated setups: exploitable via crafted links sent to users - In authenticated setups: limited to authenticated users and requires interaction
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | avo | <= 3.30.2 | 3.30.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Avohq | Avo | before 3.30.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/avo-hq/avo/commit/4453d39ddc6309f3bc8ada73ef21e1971112de7d
- https://github.com/avo-hq/avo/pull/4330
- https://github.com/avo-hq/avo/releases/tag/v3.30.3
- https://github.com/avo-hq/avo/security/advisories/GHSA-762r-27w2-q22j
- https://github.com/advisories/GHSA-762r-27w2-q22j
- https://nvd.nist.gov/vuln/detail/CVE-2026-33209
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/avo/CVE-2026-33209.yml