Cyber Resilience

CVE-2023-35171

Open Redirect in Nextcloud Server 26.0.0 – 26.0.2

Public PoCOpen Redirect
Published
23 June 2023
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 4.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N
EPSS Score 0.0059 45th percentile
Risk Priority 34 floored blend · peak EPSS

Summary

CVE-2023-35171 is a medium-severity Open Redirect (CWE-601) vulnerability in Nextcloud Nextcloud Server. Its CVSS base score is 4.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Phishing (T1566); ranked at the 45th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. Starting in version 26.0.0 and prior to version 26.0.2, an attacker could supply a URL that redirects an unsuspecting victim from a legitimate domain to…

more

an attacker's site. Nextcloud Server and Nextcloud Enterprise Server 26.0.2 contain a patch for this issue. No known workarounds are available.

CWE(s)
CWE-601

Related Threats

MITRE ATT&CK Enterprise Techniques

T1566 Phishing Initial Access
Adversaries may send phishing messages to gain access to victim systems.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-48302Same product: Nextcloud Nextcloud Server
CVE-2023-28835Same product: Nextcloud Nextcloud Server
CVE-2024-37315Same product: Nextcloud Nextcloud Server
CVE-2024-22403Same product: Nextcloud Nextcloud Server
CVE-2026-45810Same product: Nextcloud Nextcloud Server
CVE-2026-45278Same vendor: Nextcloud
CVE-2023-48304Same product: Nextcloud Nextcloud Server
CVE-2026-45282Same product: Nextcloud Nextcloud Server
CVE-2023-28834Same product: Nextcloud Nextcloud Server
CVE-2026-45283Same product: Nextcloud Nextcloud Server

Affected Assets

nextcloud
nextcloud server
26.0.0 — 26.0.2 · 26.0.0 — 26.0.2

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V3.7.2

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

AT-2 Literacy Training and Awareness
addresses: CWE-601

Security awareness includes verifying URLs and avoiding untrusted redirects that lead to malicious sites.

SI-10 Information Input Validation
addresses: CWE-601

Validates redirect targets and URLs to ensure they conform to allowed destinations.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and untrusted-redirect controls that prevent CWE-601.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.23 Web filtering partial match
mitigates

Preventing access to attacker-controlled or malicious sites stops users from being redirected to untrusted locations via open-redirect or phishing links.

References