Security readout for executives and security teams
Plain-English summary
Nextcloud Talk shared chats protected by a password could keep the same session cookie after login. If an attacker could influence a session before authentication, they might gain access to protected chat content. The vendor recommends upgrading; no workaround is listed.
Executive priority
Treat this as a moderate confidentiality risk. It is not reported as actively exploited in the provided sources, but affected deployments may expose private chat content. Upgrade through normal security maintenance, faster for collaboration systems handling sensitive discussions.
Technical view
CVE-2021-32676 is CWE-384 session fixation in Nextcloud Talk before 9.0.10, 10.0.8, and 11.2.2. The app failed to rotate the session cookie after successful authentication to password-protected shared chats. CVSS 3.1 is 6.5, with high confidentiality impact only.
Likely exposure
Exposure is likely limited to organizations running affected Nextcloud Talk versions with password-protected shared chats. Systems already upgraded to 9.0.10, 10.0.8, 11.2.2, or later are not indicated as affected by the provided sources.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates network reachability, low attack complexity, low privileges required, and no user interaction, but the provided sources do not describe real-world exploitation.
Researcher notes
Evidence is sufficient for affected versions, weakness class, CVSS, and vendor fix versions. The provided sources do not name a workaround or observed exploitation. Avoid assuming broader Nextcloud components are affected unless separate advisories support that.
Mitigation direction
- Upgrade Nextcloud Talk to 9.0.10, 10.0.8, 11.2.2, or later.
- Prioritize upgrades where password-protected shared chats are used.
- Check Nextcloud vendor guidance for any newer security instructions.
- Invalidate active sessions after upgrading where operationally feasible.
Validation and detection
- Inventory installed Nextcloud Talk app versions across all instances.
- Confirm no instance runs below 9.0.10, 10.0.8, or 11.2.2.
- Identify whether password-protected shared chats are enabled or used.
- Review access logs for unusual shared chat access patterns.
- Verify session behavior after authentication in a non-production test environment.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-384: Exact CWE lookup
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Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-32676 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-p6h7-84v4-827rCVE reference · x_refsource_CONFIRM
- https://hackerone.com/reports/1181962CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Session Fixation
Session Fixation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.