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CVE-2025-66515

15
FAUCET Score

CVE-2025-66515 affects the Nextcloud Approval app, allowing an authenticated user designated as a workflow requester to force another user's file into "pending approval" status without direct file access, by exploiting the numeric file ID. This is a low-severity vulnerability (CVSS 2.7) with a low potential impact, as it only affects integrity by initiating an approval workflow. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.0.0, < 1.3.1CPE matchmatch criteria
cpe:2.3:a:nextcloud:approval:*:*:*:*:*:nextcloud:*:*
>= 2.0.0, < 2.5.0CPE matchmatch criteria
cpe:2.3:a:nextcloud:approval:*:*:*:*:*:nextcloud:*:*

CVSS Data

CVSS version used by this source: 3.1

2.7LOW

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

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

Exploit Intelligence

EPSS Score
0.28%
Probability of exploitation in next 30 days
EPSS Percentile
19.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0028 is in the 30th percentile among its peer group of 708 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.0 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/approval/commit/e30b56b7832255311ac800b7875f44866e88fff4
Patch
github.com / nextcloud/approval/pull/334
Issue Tracking
github.com / nextcloud/security-advisories/security/advisories/GHSA-q26g-fmjq-x5g5
PatchVendor Advisory
hackerone.com / reports/3338748
Issue TrackingVendor Advisory