CVE-2023-26035
Published: 25 February 2023
Summary
CVE-2023-26035 is a high-severity Missing Authorization (CWE-862) vulnerability in Zoneminder Zoneminder. Its CVSS base score is 7.2 (High).
Operationally, ranked in the top 1.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
ZoneMinder is an open-source CCTV software application for Linux supporting IP, USB, and analog cameras. CVE-2023-26035 affects versions prior to 1.36.33 and 1.37.33 and stems from missing authorization checks on the snapshot action. An unauthenticated caller can supply an object instead of a monitor identifier, causing the TriggerOn handler to invoke shell_exec with attacker-controlled input and resulting in unauthenticated remote code execution.
An attacker with network access can exploit the flaw without authentication or user interaction to execute arbitrary commands on the server. The CVSS 7.2 rating reflects the combination of network reachability, low attack complexity, and the ability to affect confidentiality and integrity within the application's security context.
The official fix is included in ZoneMinder releases 1.36.33 and 1.37.33, as documented in the GitHub Security Advisory GHSA-72rg-h4vf-29gr. Administrators should upgrade to one of these versions to eliminate the missing authorization check.
The EPSS score rose sharply from a low baseline to a peak of 0.9692 on 2025-01-22 before receding to the current value of 0.5501, indicating that exploitation interest increased substantially after public disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-29921
Vulnerability details
ZoneMinder is a free, open source Closed-circuit television software application for Linux which supports IP, USB and Analog cameras. Versions prior to 1.36.33 and 1.37.33 are vulnerable to Unauthenticated Remote Code Execution via Missing Authorization. There are no permissions check…
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on the snapshot action, which expects an id to fetch an existing monitor but can be passed an object to create a new one instead. TriggerOn ends up calling shell_exec using the supplied Id. This issue is fixed in This issue is fixed in versions 1.36.33 and 1.37.33.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Requiring an access control policy ensures authorization checks are defined and applied for critical functions.
Reviews of access controls detect missing authorization checks on critical functions or resources.
Documenting permitted unauthenticated actions prevents missing authorization by making all exceptions explicit and subject to organizational review.
Requiring attribute association with information prevents authorization from being performed without necessary security or privacy context.
Mandating authorization prior to allowing remote connections addresses missing authorization for remote access.
Mandating authorization before wireless connections are allowed prevents missing authorization for wireless access.
The control requires authorization before allowing mobile device connections, directly mitigating missing authorization for system access.
Requiring approvals for account creation and specifying authorizations ensures authorization is not missing for system access.