How severe is CVE-2026-50739?

CVE-2026-50739 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-50739 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-50739?

CVE-2026-50739 affects Revive-adserver Revive Adserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-50739?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-50739 have an EU (EUVD) identifier?

Yes. CVE-2026-50739 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39601.

When was CVE-2026-50739 published?

CVE-2026-50739 was published on 2026-06-26 and last updated on 2026-06-29.

CVE-2026-50739

CVE-2026-50739 is a medium-severity vulnerability in Revive-adserver Revive Adserver with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39601
Weakness: CWE-284
Affected product: Revive-adserver Revive Adserver
Published: 2026-06-26
Last modified: 2026-06-29

Description

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.

Frequently asked questions

What is CVE-2026-50739?: 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.
How severe is CVE-2026-50739?: CVE-2026-50739 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-50739 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-50739?: CVE-2026-50739 affects Revive-adserver Revive Adserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-50739?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-50739 have an EU (EUVD) identifier?: Yes. CVE-2026-50739 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39601.
When was CVE-2026-50739 published?: CVE-2026-50739 was published on 2026-06-26 and last updated on 2026-06-29.

References

https://hackerone.com/reports/3780709

Affected products (1)

cpe:2.3:a:revive-adserver:revive_adserver:*:*:*:*:*:*:*:*

More vulnerabilities in Revive-adserver Revive Adserver

CVE-2016-9125 — Critical (CVSS 9.8): Revive Adserver before 3.2.3 suffers from session fixation, by allowing arbitrary session identifiers to be forced and,…
CVE-2016-9124 — Critical (CVSS 9.8): Revive Adserver before 3.2.3 suffers from Improper Restriction of Excessive Authentication Attempts. The login page of…
CVE-2017-5830 — Critical (CVSS 9.8): Revive Adserver before 4.0.1 allows remote attackers to execute arbitrary code via serialized data in the cookies…
CVE-2016-9470 — Critical (CVSS 9.0): Revive Adserver before 3.2.5 and 4.0.0 suffers from Reflected File Download. `www/delivery/asyncspc.php` was vulnerable…
CVE-2026-50741 — High (CVSS 8.8): Bypass to the fix for CVE-2026-34916. Variants of such vectors have been also reported by phucrio and offsetmd. The fix…
CVE-2025-48986 — High (CVSS 8.8): Authorization bypass in Revive Adserver 5.5.2 and 6.0.1 and earlier versions causes an logged in attacker to change…

All CVEs affecting Revive-adserver Revive Adserver →

Other CWE-284 (Improper Access Control) vulnerabilities

CVE-2026-83944 — Critical (CVSS 10.0): Improper access control in Azure Logic Apps allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-20192 — Critical (CVSS 10.0): As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine…
CVE-2026-87230 — Critical (CVSS 10.0): Vulnerability in the Oracle Hyperion Financial Management product of Oracle Hyperion (component: Security). The…
CVE-2026-54745 — Critical (CVSS 10.0): Kubeflow Pipelines enables users to build and deploy portable, scalable machine learning workflows. Prior to 2.17.0,…
CVE-2026-18886 — Critical (CVSS 10.0): ServiceNow has remediated an improper access control vulnerability that was identified in the ServiceNow AI platform.…
CVE-2026-76607 — Critical (CVSS 10.0): Joomla Extension - fabrikar.com - Missing ACL check in download element in Fabrik < 4.7.2.

Browse all CWE-284 (Improper Access Control) vulnerabilities →