XWiki Full Calendar Macro vulnerable to data leak through Calendar.JSONService

CVE-2025-65090 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Impact

Anyone who has view rights on the Calendar.JSONService page, including guest users can exploit this vulnerability by accessing database info, with the exception of passwords.

Workarounds

Remove the Calendar.JSONService page. This will however break some functionalities.

References

Jira issue:
* FULLCAL-82: Calendar.JSONService exposes emails of all users

For more information

If you have any questions or comments about this advisory:
* Open an issue in Jira XWiki.org
* Email us at Security Mailing List

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2026-01-09 18:35:57 UTC
Updated
2026-01-11 14:55:44 UTC
GitHub reviewed
2026-01-09 18:35:57 UTC
NVD published
2026-01-09

EPSS Score

Score Percentile
0.03% 7.86%

CVSS Scores

Base score Version Severity Vector
5.3 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

Type Value
GHSA GHSA-637h-ch24-xp9m ↗
CVE CVE-2025-65090 ↗

CWEs

CWE id Name
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
maven org.xwiki.contrib:macro-fullcalendar-pom <= 2.4.5 2.4.6 —

References

cvelogic Threat Intelligence