CVE-2023-26756Public exploitNetwork attack vector

Password discovery via repeated login guesses

Published Apr 14, 2023 · Updated Aug 2, 2024

Improper login-attempt restriction in Revive Adserver 5.4.1 allows remote attackers to discover passwords through repeated login guesses. The report attributes the behavior to insufficient login throttling, but the vendor states that failed and concurrent attempts receive randomized delays. Exploitation requires network access to the administration login and a correct guess; the vendor disputes the flaw and documents password-quality controls.

CVSS severity7.5
High
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper login-attempt restriction in Revive Adserver 5.4.1 allows remote attackers to discover passwords through repeated login guesses. The report attributes the behavior to insufficient login throttling, but the vendor states that failed and concurrent attempts receive randomized delays. Exploitation requires network access to the administration login and a correct guess; the vendor disputes the flaw and documents password-quality controls.

The record

CVE
CVE-2023-26756
Published
Apr 14, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-307, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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