CVE-2026-48164
MEDIUM
MEDIUM
Priority: 0.00
BB Relevance:
59/100
Published: 2026-10-30
Modified: 2026-10-30
First seen: 2026-10-30
Status: active
Attack Surface
Network
Low Complexity
No Auth
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
Required
S:
Changed
C:
None
I:
Low
A:
None
Description
Collabora Online is a collaborative online office suite based on LibreOffice technology. Prior to 24.04.18 and 25.04.11, the `host_session_id` query/form parameter is substituted into the `cool.html` editor page without HTML encoding, unlike parameters passed through the existing variable-encoding mechanism. An attacker who induces a victim to load a crafted URL can inject HTML and, in the absence of an effective `Content Security Policy`, execute scripts in the Collabora Online iframe's origin, exposing the session authentication token and page contents. A reverse proxy that preserves the `Content Security Policy` header sent by `coolwsd` mitigates the script-execution scenario. This issue is fixed in versions 24.04.18 and 25.04.11.
Weakness Classification (1)
Affected Software (4)
| Vendor | Product | Version |
|---|---|---|
| CollaboraOnline | online | < 24.04.18 |
| CollaboraOnline | online | >= 25.04.0-0, < 25.04.11 |
| CollaboraOnline | online | < 24.04.18 |
| CollaboraOnline | online | >= 25.04.0-0, < 25.04.11 |