Nextcloud flaw lets attackers force logout and switch user profiles
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
The Nextcloud build with versionCode 30390190 has a flaw (CWE-926) that lets a remote attacker with no privileges force victims to log out of their accounts and switch to an attacker-controlled profile, bypassing authentication. The attack needs no user interaction and affects integrity.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
An issue in Nextcloud versionCode 30390190 allows attackers to force victim users to logout of their accounts and switch to an attacker controlled progile, bypassing authentication.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Nextcloud.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Timeline
- 2026-10-29 Threatist record created from CVE-2026-107059
- 2026-10-29 Alias added: GHSA-f85r-vx8m-r4hr
- 2026-11-03 CVSS score added · CISA ADP
- 2026-11-03 Weakness changed · CISA ADP
- 2026-11-03 CISA SSVC decision points changed
- 2026-11-03 Priority changed: LOW → HIGH
References
Sources
- CVE-2026-107059 · CVE Program
- CVE-2026-107059 · NVD
- FIRST EPSS
- GHSA-f85r-vx8m-r4hr · GitHub Advisory Database · CC BY 4.0
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