CVE-2021-35303
CVE-2021-35303 is a medium-severity vulnerability in Zammad with a CVSS 3.x base score of 6.1. 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-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (53rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Zammad
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2021-35303?
- 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.
- How severe is CVE-2021-35303?
- CVE-2021-35303 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2021-35303 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-35303?
- CVE-2021-35303 affects Zammad. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-35303?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-35303 published?
- CVE-2021-35303 was published on 2021-06-28 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*
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