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High severity8.2NVD Advisory· Published Dec 13, 2021· Updated Jun 17, 2026

CVE-2021-43817

CVE-2021-43817

Description

Collabora Online is a collaborative online office suite based on LibreOffice technology. In affected versions a reflected XSS vulnerability was found in Collabora Online. An attacker could inject unescaped HTML into a variable as they created the Collabora Online iframe, and execute scripts inside the context of the Collabora Online iframe. This would give access to a small set of user settings stored in the browser, as well as the session's authentication token which was also passed in at iframe creation time. Users should upgrade to Collabora Online 6.4.16 or higher or Collabora Online 4.2.20 or higher. Collabora Online Development Edition 21.11 is not affected.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Collaboraonline/Online3 versions
    cpe:2.3:a:collabora:online:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:collabora:online:*:*:*:*:*:*:*:*range: <4.2.20
    • (no CPE)range: up to 6.4.16 or 4.2.20
    • (no CPE)range: >= 6.0.0, < 6.4.16

Patches

Vulnerability mechanics

References

1

News mentions

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