How severe is CVE-2026-34837?

CVE-2026-34837 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-34837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34837?

CVE-2026-34837 affects Zammad. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34837?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34837 have an EU (EUVD) identifier?

Yes. CVE-2026-34837 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20568.

When was CVE-2026-34837 published?

CVE-2026-34837 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-34837

CVE-2026-34837 is a medium-severity vulnerability in Zammad with a CVSS 3.x base score of 4.3. 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v4: 5.3
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20568
Weakness: CWE-862
Affected product: Zammad
Published: 2026-04-08
Last modified: 2026-06-17

Description

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, he REST endpoint POST /api/v1/ai_assistance/text_tools/:id contains an authorization failure. Context data (e.g., a group or organization) supplied to be used in the AI prompt were not checked if they are accessible for the current user. This leads to having data present in the AI prompt that were not authorized before being used. A user needs to have ticket.agent permission to be able to use the provided context data. This vulnerability is fixed in 7.0.1.

Frequently asked questions

What is CVE-2026-34837?: Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, he REST endpoint POST /api/v1/ai_assistance/text_tools/:id contains an authorization failure. Context data (e.g., a group or organization) supplied to be used in the AI prompt were not checked if they are accessible for the current user. This leads to having data present in the AI prompt that were not authorized before being used. A user needs to have ticket.agent permission to be able to use the provided context data. This vulnerability is fixed in 7.0.1.
How severe is CVE-2026-34837?: CVE-2026-34837 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-34837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34837?: CVE-2026-34837 affects Zammad. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34837?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34837 have an EU (EUVD) identifier?: Yes. CVE-2026-34837 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20568.
When was CVE-2026-34837 published?: CVE-2026-34837 was published on 2026-04-08 and last updated on 2026-06-17.

References

https://github.com/zammad/zammad/security/advisories/GHSA-89vv-6639-wcv8

Affected products (1)

cpe:2.3:a:zammad:zammad:7.0.0:*:*:*:*:*:*:*

More vulnerabilities in Zammad

CVE-2022-48021 — Critical (CVSS 9.8): A vulnerability in Zammad v5.3.0 allows attackers to execute arbitrary code or escalate privileges via a crafted…
CVE-2022-35490 — Critical (CVSS 9.8): Zammad 5.2.0 is vulnerable to privilege escalation. Zammad has a prevention against brute-force attacks trying to guess…
CVE-2021-42090 — Critical (CVSS 9.8): An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because…
CVE-2021-42094 — Critical (CVSS 9.8): An issue was discovered in Zammad before 4.1.1. Command Injection can occur via custom Packages.
CVE-2020-26030 — Critical (CVSS 9.8): An issue was discovered in Zammad before 3.4.1. There is an authentication bypass in the SSO endpoint via a crafted…
CVE-2017-6080 — Critical (CVSS 9.8): An issue was discovered in Zammad before 1.0.4, 1.1.x before 1.1.3, and 1.2.x before 1.2.1, caused by lack of a…

All CVEs affecting Zammad →

Other CWE-862 (Missing Authorization) vulnerabilities

CVE-2026-0092 — Critical (CVSS 10.0): In Package Manager, there is a possible device lock controller bypass due to a missing permission check. This could…
CVE-2026-33712 — Critical (CVSS 10.0): Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the preview chat endpoint (POST…
CVE-2026-2031 — Critical (CVSS 10.0): An Improper Access Control vulnerability in several internal API endpoints for Google Cloud Application Integration…
CVE-2026-34976 — Critical (CVSS 10.0): Dgraph is an open source distributed GraphQL database. Prior to 25.3.1, the restoreTenant admin mutation is missing…
CVE-2025-30416 — Critical (CVSS 10.0): Sensitive data disclosure and manipulation due to missing authorization. The following products are affected: Acronis…
CVE-2025-45854 — Critical (CVSS 10.0): /server/executeExec of JEHC-BPM 2.0.1 allows attackers to execute arbitrary code via execParams.

Browse all CWE-862 (Missing Authorization) vulnerabilities →