Security readout for executives and security teams
Plain-English summary
This is a low-severity information disclosure in Nextcloud Text. Vulnerable versions could show users raw error messages that reveal full server file paths for shared files. It does not indicate data modification, service disruption, or unauthenticated compromise, but leaked paths can help attackers understand server layout.
Executive priority
Handle in the normal patch cycle, with faster action for internet-facing or sensitive collaboration environments. The direct impact is limited, but server path disclosure can support follow-on reconnaissance.
Technical view
CWE-209: Nextcloud Text returned verbatim exception messages to users. For shared files, those messages could disclose full filesystem paths. The CVSS vector requires network access and low privileges, with high attack complexity and confidentiality-only impact. Fixed releases are 19.0.13, 20.0.11, and 21.0.3.
Likely exposure
Exposure is most likely in self-hosted Nextcloud Server environments running affected 19.x, 20.x, or 21.x versions with the Text app enabled and shared-file workflows in use.
Exploitation context
The bundle does not show active exploitation, and CISA KEV status is false. Public reporting exists through GitHub advisories, a pull request, HackerOne, and Gentoo guidance, but the cited evidence describes path disclosure rather than weaponized exploitation.
Researcher notes
The sources identify Nextcloud Text within Nextcloud Server and affected ranges before 19.0.13, 20.0.11, and 21.0.3. Evidence supports CWE-209 information exposure only. No source in the bundle confirms active exploitation or broader product impact.
Mitigation direction
- Upgrade Nextcloud Server to 19.0.13, 20.0.11, 21.0.3, or later.
- Disable the Nextcloud Text application if immediate upgrade is not possible.
- Check vendor and distribution advisories for package-specific update guidance.
- Prioritize internet-facing or externally shared Nextcloud instances first.
Validation and detection
- Inventory Nextcloud Server versions across production and staging systems.
- Confirm whether the Nextcloud Text application is enabled.
- Verify affected branches are at or above the fixed versions.
- Review shared-file error handling for absence of full filesystem paths.
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-209: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-32734 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Low
- CVSS
- 3.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/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:H/PR:L/UI:N/S:U/C:L/I:N/A:N1.61.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.1LowVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6hf5-c2c4-2526CVE reference · x_refsource_CONFIRM
- https://github.com/nextcloud/text/pull/1695CVE reference · x_refsource_MISC
- https://hackerone.com/reports/1246721CVE reference · x_refsource_MISC
- GLSA-202208-17CVE reference · vendor-advisory, x_refsource_GENTOO
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.
Generation of Error Message Containing Sensitive Information
Generation of Error Message Containing Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.