# CVE-2026-34917: Revive Adserver authentication bypass via session reuse in XML-RPC API

Source: https://junglewise.ai/threats/cve-2026-34917-revive-adserver-authentication-bypass-via-session-reuse-in-xml  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-23. Updated: 2026-06-23  
License: CC BY 4.0 with a link back

CVE-2026-34917 · Severity: medium · CVSS 4.3 · Published 2026-06-23

A security flaw in Revive Adserver allows users with low-level access to the web management console to reuse their login sessions to access the XML-RPC API. This API is normally restricted to administrators, meaning a regular user could gain unauthorized access to administrative functions. This could lead to unauthorized changes to advertising campaigns or exposure of sensitive configuration data.

Technologies: [Revive-Adserver Adserver](https://junglewise.ai/threats/technologies/adserver). Vendors: [Revive-Adserver](https://junglewise.ai/threats/vendors/revive-adserver).

## Quick answers

**Is CVE-2026-34917 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34917 being exploited in the wild.

**How severe is CVE-2026-34917?** Medium severity, with a CVSS score of 4.3, published 23 June 2026.

**Which products and versions are affected?** Revive-Adserver Adserver <= 6.0.6.

**Is there a fix for CVE-2026-34917?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-34917 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-34917?** Check whether you run Revive-Adserver Adserver at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is classified as Improper Authentication (CWE-287) due to session reuse across different security contexts. Specifically, session IDs generated for the web-based administrative interface were valid for authentication against the XML-RPC API, which is intended to be restricted to high-privileged administrative accounts. An attacker with valid low-privileged credentials can capture their session ID and replay it against API endpoints to bypass intended access controls. The fix involves recording the session context (Web vs. API) to ensure session IDs are not interchangeable. The issue affects Revive Adserver versions up to and including 6.0.6.

## Affected products

- Revive Adserver <= 6.0.6

## Timeline

- 2026-06-23: advisory: NVD publication date

## References

- [https://hackerone.com/reports/3672641](https://hackerone.com/reports/3672641)

## Related threats

- [Revive Adserver CSRF in zone-include.php](https://junglewise.ai/threats/cve-2026-50743-revive-adserver-csrf-in-zone-include-php)
- [Revive Adserver reflected XSS in stats-video.php](https://junglewise.ai/threats/cve-2026-50745-revive-adserver-reflected-xss-in-stats-video-php)
- [Revive Adserver auth bypass in XML-RPC API](https://junglewise.ai/threats/cve-2026-50744-revive-adserver-auth-bypass-in-xml-rpc-api)
- [Revive Adserver stored XSS in maintenance tools](https://junglewise.ai/threats/cve-2026-50742-revive-adserver-stored-xss-in-maintenance-tools)
- [Revive Adserver code injection bypass in XML-RPC API](https://junglewise.ai/threats/cve-2026-50741-revive-adserver-code-injection-bypass-in-xml-rpc-api)