CVE-2026-34917 Auth bypass in Adserver
Attackers can reuse low-privileged web console session IDs to access the admin-restricted XML-RPC API, gaining unauthorized privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34917?
CVE-2026-34917 is a medium-severity authentication bypass 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
Low‑privileged session IDs generated for the web admin console could be reused in the XML‑RPC API, whose authentication is normally restricted to admin users. An attacker could leverage this to gain unauthorised access and exploit API‑level vulnerabilities. The session context (web/API) is now recorded along with other session data, preventing session IDs from being used interchangeably.
Weakness: CWE-287
Which versions are affected by CVE-2026-34917?
How do I fix CVE-2026-34917?
No fix has been published for CVE-2026-34917 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-34917 being exploited?
There is no known exploitation of CVE-2026-34917 in the wild and no public exploit code.
Sources
Also known as GHSA-hmrw-59p6-9fgx.