Security readout for executives and security teams
Plain-English summary
A flaw in the DrawIO diagramming add-on for ownCloud 10 lets an authenticated user plant malicious code inside a diagram. When a colleague opens that diagram, the code runs in their browser session, potentially exposing files or letting the attacker act as them inside ownCloud. Vendor patches are available and should be applied.
Executive priority
Treat as a near-term patch priority for any ownCloud 10 deployment that uses DrawIO. Business risk centers on account takeover and data exposure through a trusted internal tool; the fix is a straightforward vendor upgrade with limited operational disruption.
Technical view
CVE-2025-53831 is a stored cross-site scripting (CWE-79) issue in DrawIO for ownCloud prior to 1.0.2 (bundled with ownCloud 10 before 10.15.3). Input is not properly neutralized during web page generation, so an authenticated user with DrawIO access can persist script content that executes when other users render the diagram. CVSS 3.1 is 8.2 with scope change (AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L).
Likely exposure
Organizations running ownCloud Classic (10.x) with the DrawIO app enabled are exposed, especially where diagrams are shared across teams or with external collaborators. Any authenticated user with DrawIO access can plant the payload, so multi-tenant, education, and workgroup deployments face the greatest risk.
Exploitation context
No public reports of in-the-wild exploitation and the flaw is not listed in CISA KEV as of this writing. The advisory (GHSA-r9j8-fr2h-m47q) confirms the vulnerability class and fix. Exploitation requires an authenticated account plus victim interaction (UI:R), which lowers opportunistic risk but keeps insider or shared-tenant abuse plausible.
Researcher notes
Scope-changed stored XSS (S:C) in a document-rendering app is a classic pivot to session hijack or CSRF-style actions against ownCloud APIs. Only the confirmed vendor advisory is public; no PoC, exploit chain, or KEV entry is referenced. Validate CSP posture and whether diagram rendering occurs same-origin, as that governs blast radius.
Mitigation direction
- Upgrade ownCloud 10 to 10.15.3 or later, or update DrawIO for ownCloud to 1.0.2 or later.
- If patching is delayed, disable or restrict the DrawIO app to trusted users only.
- Tighten sharing settings so diagrams are not opened by unintended audiences.
- Review vendor advisory GHSA-r9j8-fr2h-m47q for any deployment-specific guidance.
- Enforce strong session and CSP controls on the ownCloud front end to blunt XSS impact.
Validation and detection
- Inventory ownCloud 10 instances and confirm installed versions of the core and DrawIO app.
- Confirm DrawIO for ownCloud is at 1.0.2+ and ownCloud is at 10.15.3+ after patching.
- Audit stored diagrams for suspicious script-like content authored before the upgrade.
- Review ownCloud and reverse-proxy logs for unusual DrawIO activity or session anomalies.
- Re-run authenticated web application scans against the DrawIO endpoints post-patch.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2025-53831 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
- High
- CVSS
- 8.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
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SSVC decision data
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:R/S:C/C:H/I:L/A:L2.35.3GitHub_MVulnerability scoring details
Base CVSS 3.1 score
8.2HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/owncloud/security-advisories/security/advisories/GHSA-r9j8-fr2h-m47qCVE reference, GitHub_M · x_refsource_CONFIRM
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.