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CVE-2023-45150

15
FAUCET Score

CVE-2023-45150 is a denial-of-service vulnerability affecting the Nextcloud Calendar app (versions prior to 4.4.4). The flaw stems from insufficient input validation, allowing the server to process excessively long strings as email addresses, leading to resource exhaustion and unresponsiveness. With a CVSS score of 4.3 (Medium), this vulnerability can be exploited remotely by an authenticated attacker, resulting in a low impact on availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.0, < 4.4.4CPE matchmatch criteria
cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 41st percentile among its peer group of 21,957 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/5358
Patch
github.com / nextcloud/security-advisories/security/advisories/GHSA-r936-8gwm-w452
Vendor Advisory
hackerone.com / reports/2058337
ExploitIssue Tracking