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% (21st 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% (21st 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% (21st 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:*:*:*:*:*:*:*:*

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