CVE-2026-34917Network attack vector

Authenticated API access via cross-context session reuse

Published Jun 23, 2026 · Updated Jun 23, 2026

Improper authentication in Revive Adserver 6.0.6 and earlier allows remote authenticated users to access administrator-only XML-RPC APIs. The v1 and v2 BaseServiceImpl::verifySession methods accepted any logged-in OA_Auth session without distinguishing UI sessions from API sessions. A low-privileged web-console account and its session ID are required; successful reuse exposes administrator-only API data but does not directly alter data or interrupt service.

CVSS severity4.3
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Revive Adserver 6.0.6 and earlier allows remote authenticated users to access administrator-only XML-RPC APIs. The v1 and v2 BaseServiceImpl::verifySession methods accepted any logged-in OA_Auth session without distinguishing UI sessions from API sessions. A low-privileged web-console account and its session ID are required; successful reuse exposes administrator-only API data but does not directly alter data or interrupt service.

The record

CVE
CVE-2026-34917
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
Revive Adserver Project
Product
Revive Adserver
Classifications
CWE-287, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=6.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Revive Adserver Project · Revive Adserverversion=0 <=6.0.6

Published CVSS scores

4.3HackerOneCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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