EUVD-2026-39601
GHSA-v78r-pfp2-f4c7
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessAuthenticate as low-privileged user
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DeliveryAccess tracker-campaigns.php via HTTP
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ExploitCraft reverse-link request targeting foreign campaign ID
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ExecutionBypass missing ownership check
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PersistAssociate own trackers with another manager's campaigns
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ImpactCorrupt cross-manager ownership records
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK
1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Requires an authenticated low-privileged user account on the Revive Adserver instance (confirmed by CVSS PR:L). The instance must host multiple manager accounts with separate campaign ownership for cross-manager abuse to be meaningful - single-manager deployments have no exploitable trust boundary to cross. The specific vulnerable operation is the reverse linking action in |
| Impact | The CVSS 3.0 score of 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N) accurately reflects the bounded impact of this flaw. Attack vector is network with low complexity, meaning no special positioning or chained preconditions are needed beyond holding a valid low-privileged account. Impact is strictly limited to low integrity, with no confidentiality or availability effect, consistent with the nature of the abuse: polluting campaign-tracker ownership records rather than accessing or destroying data. No EPSS score is available in the provided data, but the absence of KEV listing and no known public exploit code suggest limited real-world exploitation activity. The primary risk is to multi-tenant shared Revive Adserver deployments where isolation between manager accounts is a trust boundary. Single-manager instances are not exposed to meaningful harm from this issue. The risk is real but operationally narrow. |
| Exploit ScenarioDerived | An attacker holding a low-privileged account on a shared Revive Adserver instance sends a crafted HTTP request to |
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Alert meAnalysisAIv1 – Jun 26, 2026
Ownership validation bypass in Revive Adserver 6.0.7 and earlier allows a low-privileged authenticated user to link their own trackers to campaigns belonging to other managers on the same instance via the tracker-campaigns.php script. This is a bypass of the fix introduced for CVE-2026-34913, which applied ownership checks only to the forward linking operation but omitted the reverse direction. The impact is confined to integrity - specifically, creation of inconsistent cross-manager ownership relationships - with no confidentiality or availability consequences. No public exploit identified at time of analysis.
RemediationAI
Upgrade Revive Adserver to a version that incorporates the corrected ownership validation for the reverse tracker-campaign linking operation in tracker-campaigns.php. No exact patched release version is confirmed from the available reference data; the HackerOne report at https://hackerone.com/reports/3780709 should be consulted for the vendor's official fix version once the report becomes public. As a compensating control for multi-manager deployments pending a patch, administrators can restrict low-privileged users' access to the tracker-campaigns.php endpoint via web server ACLs or application-level role restrictions, accepting the trade-off that tracker-campaign linking functionality will be unavailable to those users. Single-manager deployments face negligible risk and no immediate action is required beyond monitoring for an official patch.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Revive Adserver is an open-source PHP-based ad serving platform (cpe:2.3:a:revive:adserver:*:*:*:*:*:*:*:*). The tracker-campaigns.php script manages the bidirectional relationship between tracker and campaign entities. The prior fix for CVE-2026-34913 introduced ownership validation for one direction of this linking operation but failed to apply the same guard to the reverse operation, a classic incomplete-fix pattern. CWE-284 (Improper Access Control) captures the root cause: the authorization decision - verifying campaign ownership before permitting a link - was not uniformly enforced across all code paths executing the same logical action. The PHP tag confirms the server-side language context and that no client-side exploitation is involved.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Low-privilege authentication required over network; impact is integrity-only, limited to cross-manager ownership record pollution with no confidentiality or availability effect.
Primary rating from Vendor (hackerone).
CVSS VectorVendor: hackerone
DescriptionCVE.org
A bypass for CVE‑2026‑34913 exists with proper ownership validation that had not been applied to the reverse operation of linking campaigns and trackers through the tracker-campaigns.php script in Revive Adserver 6.0.7 and earlier. As a result, a low‑privileged user could link their trackers to campaigns owned by other managers on the same instance, leading to inconsistent ownership relationships.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
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