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CVE-2023-33183

16
FAUCET Score

CVE-2023-33183 is a medium-severity vulnerability affecting the Nextcloud Calendar app, where internal website paths can be disclosed if the configured SMTP server is unavailable. This information disclosure, rated 4.3 CVSS, could potentially expose sensitive system details to an authenticated attacker with low privileges. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability. Users are advised to update the Calendar app to versions 3.5.5 or 4.2.3 to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.5.5CPE matchmatch criteria
cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*
>= 4.0.0, < 4.2.3CPE matchmatch criteria
cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

2.6LOW

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
35.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 45th percentile among its peer group of 21,954 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / nextcloud/calendar/pull/4938
Patch
github.com / nextcloud/security-advisories/security/advisories/GHSA-2792-2734-hr7j
Vendor Advisory