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CVE-2023-39957

22
FAUCET Score

CVE-2023-39957 is a high-severity vulnerability affecting Nextcloud Talk Android versions prior to 17.0.0, where an unprotected intent could allow malicious third-party applications to write files outside the app's designated cache directory. With a CVSS score of 7.8, this local vulnerability requires user interaction and could lead to high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability. Users are advised to update to Nextcloud Talk Android version 17.0.0 or later to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 17.0.0CPE matchmatch criteria
cpe:2.3:a:nextcloud:talk:*:*:*:*:*:android:*:*
17.0.0CPE matchmatch criteria
cpe:2.3:a:nextcloud:talk:17.0.0:rc1:*:*:*:android:*:*
17.0.0CPE matchmatch criteria
cpe:2.3:a:nextcloud:talk:17.0.0:rc2:*:*:*:android:*:*
17.0.0CPE matchmatch criteria
cpe:2.3:a:nextcloud:talk:17.0.0:rc3:*:*:*:android:*:*

CVSS Data

CVSS version used by this source: 3.0

7.2HIGH

CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.6
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.33%
Probability of exploitation in next 30 days
EPSS Percentile
25.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0033 is in the 24th percentile among its peer group of 11,621 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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/security-advisories/security/advisories/GHSA-36f7-93f3-mcfj
PatchVendor Advisory
github.com / nextcloud/talk-android/pull/3064
Patch
hackerone.com / reports/1997029
Issue TrackingThird Party Advisory