6.5

CVE-2026-77165: nextcloud server Improper Access Control

CVSS: 6.5v3.0MediumDeferred
AliasesCGA-965h-fg32-4r24CGA-9v64-wmpg-rcg5CGA-274c-874x-4472
Published 21-09-2026Last modified 21-09-2026
Open JSON

Vulnerability summary

CVE-2026-77165 is a medium (CVSS 6.5) Improper Access Control vulnerability in nextcloud server. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.4% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.0 (CVE.org)
EPSS score
0.41%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 21-09-2026
    PublishedVulnerability first disclosed.
  2. 21-09-2026
    Last modifiedVulnerability information updated.

Description

File owners were unable to unlock TYPE_TOKEN locks placed by other users, leaving files permanently locked with no recovery path outside of the database.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

22-09-202619-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • nextcloud-server-32All versions (No fix recorded)
  • nextcloud-server-33All versions (No fix recorded)
Nextcloud1 product
Wolfi1 product
  • nextcloud-server-33All versions (No fix recorded)

3 vendors · 4 products

References

1 links