CVE-2021-35303
Cross Site Scripting (XSS) in Zammad 1.0.x up to 4.0.0 allows remote attackers to execute...
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 the User Avatar attribute.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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 the User Avatar attribute.
- Record
CVE-2021-35303- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
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 the User Avatar attribute.
- Record
CVE-2021-35303- Updated
- 2026-11-02
EUVDEUVD-2021-21946 No score
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 the User Avatar attribute.
- Record
EUVD-2021-21946- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-hwv7-wjc3-wjwc No score
Cross Site Scripting (XSS) in Zammad 1.0.x up to 4.0.0 allows remote attackers to execute...
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 the User Avatar attribute.
- Record
GHSA-hwv7-wjc3-wjwc- Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
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 the User Avatar attribute.
- Record
CVE-2021-35303- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-35303 is a medium vulnerability (CVSS 6.1) in Zammad, published June 28, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.83%, the 57th percentile. No source names a fixed version.