Zammad vulnerabilities2 known to be exploited.
Zammad has 80 published vulnerabilities across 1 product in our catalogue. 2 of them are on the list of flaws known to be exploited, so criminals are using them now. The most affected product is Zammad, with 80. If you run Zammad software, patch the exploited flaws first.
The most recent Zammad flaw added to the known-exploited list is CVE-2026-102489, on 2 October 2026. We keep watching the known-exploited list.
Which Zammad products have the most vulnerabilities?
Zammad leads with 80 published vulnerabilities. Open a product to see its versions and which of its flaws criminals are already using.
Which Zammad vulnerabilities are being exploited?
2 flaws are on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 9.4Zammad GmbH Zammad Session Fixation Vulnerability
Zammad GmbH Zammad contains a session fixation vulnerability that can lead to remote code execution as the zammad user.
- 9.4Zammad GmbH Zammad Improper Privilege Management Vulnerability
Zammad GmbH Zammad contains an improper privilege management vulnerability that can allow the local zammad user to escalate privileges to root.
Which Zammad flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- 2.3%CVE-2021-42090Critical
An issue was discovered in Zammad before 4.1.1.
- 1.9%CVE-2021-42094Critical
An issue was discovered in Zammad before 4.1.1.
- 1.5%CVE-2017-5619Critical
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.
- 1.5%CVE-2018-1000154Medium
Zammad GmbH Zammad version 2.3.0 and earlier contains a Improper Neutralization of Script-Related HTML Tags in a Web Page (CWE-80) vulnerability in the subject of emails which are not html quoted in certain cases.
- 1.5%CVE-2021-35298Medium
Cross Site Scripting (XSS) in Zammad 1.0.x up to 4.0.0 allows remote attackers to execute arbitrary web script or HTML via multiple models that contain a 'note' field to store additional information.
- 1.4%CVE-2020-26030Critical
An issue was discovered in Zammad before 3.4.1.
- 1.3%CVE-2021-42093High
An issue was discovered in Zammad before 4.1.1.
- 1.3%CVE-2019-1010018Medium
Zammad GmbH Zammad 2.3.0 and earlier is affected by: Cross Site Scripting (XSS) - CWE-80.
- 1.3%
Zammad versions 6.3.0 to 6.5.4 are vulnerable a session hijack vulnerability that leads to remote code execution as the zammad user.
- 1.2%CVE-2021-35301Medium
Incorrect Access Control in Zammad 1.0.x up to 4.0.0 allows remote attackers to obtain sensitive information via the Ticket Article detail view.
All Zammad products we track.
1 products, most vulnerabilities first. Find the ones you run, then open a product to see its versions and exploited flaws.
Running Zammad? We'll keep checking.
Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.
- Tell us what you runPick your software from a list, or let us work it out from your website.
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- Ranked by real-world riskA 0 to 100 score, led by evidence criminals are using it.
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1 flaw being exploited affects software Acme tracks
Zammad GmbH Zammad contains a session fixation vulnerability that can lead to remote code execution as the zammad user. This vulnerability can be chained with CVE-2026-102490.
- Matched to
- Zammad on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
Our catalogue lists 80 published vulnerabilities across 1 product and 85 versions from Zammad. The most recent Zammad flaw added to the known-exploited list is CVE-2026-102489, on 2 October 2026.
2 Zammad vulnerabilities are on the list of flaws known to be exploited. The most recently added are CVE-2026-102489 and CVE-2026-102490. The full list is on this page.
Zammad, with 80 published vulnerabilities. Its own page lists the ones known to be exploited.
Create a Precursor Intelligence account and track the Zammad products you run. We match them against every published flaw, give each one a risk score from 0 to 100 and tell you as soon as we spot one that affects you, by email, in the app or by webhook.