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PatchSiren cyber security CVE debrief

CVE-2026-44959 Revive CVE debrief

CVE-2026-44959 is a high-severity vulnerability in Revive Adserver 6.0.6 and earlier versions. The issue arises from a missing validation of user input when saving delivery limitations, allowing a low-privileged user to inject malicious PHP code. This code would then be executed during banner delivery. The vulnerability has been assigned a CVSS score of 8.8 and is considered high severity. Input sanitization has been improved in later versions to prevent such attacks.

Vendor
Revive
Product
Adserver
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-23
Original CVE updated
2026-06-23
Advisory published
2026-06-23
Advisory updated
2026-06-23

Who should care

Organizations using Revive Adserver 6.0.6 or earlier should prioritize patching this vulnerability. Low-privileged users with access to the ad server could potentially exploit this issue, making it crucial for administrators to ensure their systems are updated.

Technical summary

The vulnerability exists due to insufficient validation of user input when saving delivery limitations in Revive Adserver. Specifically, an attacker could add an unexpected component parameter and inject malicious PHP code into the compiled limitations field. This code would then be executed when banners are delivered, potentially allowing for arbitrary code execution. The CVSS vector for this vulnerability is CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating a high level of exploitability and potential impact.

Defensive priority

Given the high CVSS score of 8.8 and the potential for code execution, this vulnerability should be prioritized for immediate patching. Administrators should review their current version of Revive Adserver and update to a patched version as soon as possible.

Recommended defensive actions

  • Review and update Revive Adserver to a version that includes input sanitization improvements.
  • Restrict access to delivery limitation settings to only trusted, high-privileged users.
  • Monitor ad server logs for suspicious activity indicative of potential exploitation attempts.
  • Implement additional security measures such as web application firewalls (WAFs) to detect and prevent code injection attacks.
  • Regularly review and update software dependencies to ensure the latest security patches are applied.

Evidence notes

The CVE record and NVD detail provide official information about the vulnerability. A HackerOne report also discusses this issue, indicating community awareness and potential exploitation scenarios. However, specific details about exploitation are limited, and no public exploits are known.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-44959 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-44959

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-44959 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-44959

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.