CVE-2026-33456 | Checkmk up to 2.4.0p25/2.5.0b3 Notification Test Page delimiter

VDB-356805 · CVE-2026-33456 · WID-SEC-2026-1050 CHECKMK UP TO 2.4.0P25/2.5.0B3 NOTIFICATION TEST PAGE DELIMITER HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.5 $0-$5k 1.88 Summaryinfo A vulnerability, which was classified as problematic, has been found in Checkmk up to 2.4.0p25/2.5.0b3. This impacts an unknown function of the component Notification Test Page. Performing a manipulation results in delimiter. This vulnerability is known as CVE-2026-33456. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component. Detailsinfo A vulnerability classified as problematic has been found in Checkmk up to 2.4.0p25/2.5.0b3. This affects an unknown functionality of the component Notification Test Page. The manipulation with an unknown input leads to a delimiter vulnerability. CWE is classifying the issue as CWE-140. The product does not neutralize or incorrectly neutralizes delimiters. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is: Livestatus injection in the notification test mode in Checkmk <2.5.0b4 and <2.4.0p26 allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands via a crafted service description. The advisory is shared at checkmk.com. This vulnerability is uniquely identified as CVE-2026-33456 since 03/20/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. Neither technical details nor an exploit are publicly available. Upgrading to version 2.4.0p26 or 2.5.0b4 eliminates this vulnerability. The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-1050). Affected Checkmk Checkmk Productinfo Name Checkmk Version 2.4.0p25 2.5.0b3 CPE 2.3info 🔒 🔒 CPE 2.2info 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 4.7 VulDB Meta Temp Score: 4.5 VulDB Base Score: 4.7 VulDB Temp Score: 4.5 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Delimiter CWE: CWE-140 / CWE-20 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Checkmk 2.4.0p26/2.5.0b4 Timelineinfo 03/20/2026 CVE reserved 04/10/2026 +20 days Advisory disclosed 04/10/2026 +0 days VulDB entry created 04/10/2026 +0 days VulDB entry last update Sourcesinfo Advisory: checkmk.com Status: Confirmed CVE: CVE-2026-33456 (🔒) GCVE (CVE): GCVE-0-2026-33456 GCVE (VulDB): GCVE-100-356805 CERT Bund: WID-SEC-2026-1050 - Checkmk: Mehrere Schwachstellen Entryinfo Created: 04/10/2026 11:23 Updated: 04/10/2026 13:44 Changes: 04/10/2026 11:23 (65), 04/10/2026 13:44 (7) Complete: 🔍 Cache ID: 99:6C6:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸