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CVE-2025-66548

20
FAUCET Score

CVE-2025-66548 affects Nextcloud Deck versions prior to 1.12.7, 1.14.4, and 1.15.1, allowing attackers to spoof file extensions using Right-to-Left Override (RTLO) characters. This medium severity vulnerability (CVSS 5.5) requires user interaction and local access, potentially leading to information disclosure (C:H) by tricking users into downloading malicious files. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.12.7CPE matchmatch criteria
cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*
>= 1.14.0, < 1.14.4CPE matchmatch criteria
cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*
>= 1.15.0, < 1.15.1CPE matchmatch criteria
cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.3LOW

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.13%
Probability of exploitation in next 30 days
EPSS Percentile
3.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0013 is in the 4th percentile among its peer group of 5,760 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 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 0.1 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/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a
Patch
github.com / nextcloud/deck/pull/6671
Issue Tracking
github.com / nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6
PatchVendor Advisory
hackerone.com / reports/2326618
Permissions RequiredVendor Advisory