How severe is CVE-2023-26756?

CVE-2023-26756 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-26756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26756?

CVE-2023-26756 affects Revive Adserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26756?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-26756 published?

CVE-2023-26756 was published on 2023-04-14 and last updated on 2026-06-17.

CVE-2023-26756

CVE-2023-26756 is a high-severity vulnerability in Revive Adserver with a CVSS 3.x base score of 7.5. 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-307.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-307
Affected product: Revive Adserver
Published: 2023-04-14
Last modified: 2026-06-17

Description

The login page of Revive Adserver v5.4.1 is vulnerable to brute force attacks. NOTE: The vendor's position is that this is effectively mitigated by rate limits and password-quality features.

Frequently asked questions

What is CVE-2023-26756?: The login page of Revive Adserver v5.4.1 is vulnerable to brute force attacks. NOTE: The vendor's position is that this is effectively mitigated by rate limits and password-quality features.
How severe is CVE-2023-26756?: CVE-2023-26756 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-26756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26756?: CVE-2023-26756 affects Revive Adserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26756?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-26756 published?: CVE-2023-26756 was published on 2023-04-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:revive:adserver:5.4.1:*:*:*:*:*:*:*

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