# CVE-2026-34913: Missing authorization in Adserver

> Low-privileged users can link their trackers to campaigns owned by other managers, violating ownership boundaries in Revive Adserver.

- **Severity:** Medium 4.3 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jun 2026
- **Updated:** 23 Jun 2026
- **Also known as:** GHSA-r7wr-vr9q-m8f9

## What is CVE-2026-34913?

CVE-2026-34913 is a medium-severity missing authorization vulnerability in Revive Adserver, published on 23 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A missing access control check when linking trackers to campaigns through the campaign-trackers.php script of Revive Adserver 6.0.6 and earlier could allow a low‑privileged user to link their trackers to campaigns owned by other managers on the same instance, resulting in inconsistent ownership relationships. Ownership validation has been added to ensure that campaigns can only be linked to trackers owned by the same advertiser.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-34913?


## How do I fix CVE-2026-34913?

No fix has been published for CVE-2026-34913 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-34913 being exploited?

There is no known exploitation of CVE-2026-34913 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34913 and fix it if it is affected.

What it is: CVE-2026-34913 is a medium-severity missing authorization vulnerability in Revive Adserver, published on 23 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-34913 in the wild and no public exploit code.

Affected product: Revive Adserver. 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-2026-34913/ (Markdown: https://insights.sbomify.com/CVE-2026-34913/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34913
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34913
- OSV: https://osv.dev/vulnerability/CVE-2026-34913

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34913/
Summaries are generated and may contain mistakes; the official description above is the record.