Security readout for executives and security teams
Plain-English summary
The Anti-Virus add-on for ownCloud 10 has a critical flaw that lets an authenticated attacker with elevated privileges trick the server into making requests to systems it should not touch. This can expose internal services or sensitive data behind the firewall. ownCloud has released fixes; organizations running affected versions should upgrade promptly.
Executive priority
Treat as an urgent patching action for any environment running ownCloud 10 with the Anti-Virus app. The CVSS 9.1 score and scope-changed impact justify prioritizing this over routine maintenance windows, even though high privileges are required and no active exploitation is reported in the cited sources.
Technical view
A Server-Side Request Forgery (CWE-918) exists in Anti-Virus for ownCloud before 1.2.3, corresponding to ownCloud 10 prior to 10.15.3. CVSS 9.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H) reflects network-reachable exploitation requiring high privileges, no user interaction, and a scope change with high impact to confidentiality, integrity, and availability. Fixed in Anti-Virus 1.2.3 and ownCloud 10.15.3.
Likely exposure
Any ownCloud 10 deployment with the Anti-Virus app enabled on versions below 10.15.3 or Anti-Virus below 1.2.3 is exposed. Internet-facing ownCloud instances increase risk of pivoting to internal cloud metadata endpoints or unauthenticated internal services. Purely internal deployments still face risk from any authorized high-privilege account being abused or compromised.
Exploitation context
No public exploitation is cited in the sources and the CVE is not listed in CISA KEV as of the advisory. CVSS requires high privileges, which narrows opportunistic mass exploitation but does not eliminate insider abuse or post-compromise pivoting. The scope-changed impact underscores that a successful request can reach systems beyond the ownCloud boundary.
Researcher notes
Root cause is an SSRF (CWE-918) in the Anti-Virus for ownCloud integration. The CVSS vector's scope change indicates the vulnerable component can influence resources beyond its security authority, consistent with SSRF pivoting. The vendor advisory (GHSA-3wg4-mg27-hj4w) is the authoritative source; no technical proof-of-concept, IOC set, or KEV entry is cited in the bundle.
Mitigation direction
- Upgrade ownCloud 10 to 10.15.3 or later on all instances running the Anti-Virus app.
- Upgrade the Anti-Virus for ownCloud app to 1.2.3 or later where managed independently.
- Restrict outbound network egress from ownCloud servers to only required destinations.
- Block ownCloud egress to cloud metadata endpoints and internal management interfaces.
- Review and minimize accounts holding administrative or high-privilege roles in ownCloud.
- Monitor ownCloud logs for unexpected outbound requests initiated by the Anti-Virus component.
Validation and detection
- Confirm ownCloud 10 core version is 10.15.3 or newer via the admin panel or occ status.
- Verify Anti-Virus app version is 1.2.3 or newer under installed apps.
- Enumerate all ownCloud instances and check whether the Anti-Virus app is enabled.
- Review egress firewall or proxy logs for anomalous requests from ownCloud application servers.
- Audit ownCloud administrator and elevated-role accounts against current authorization records.
- Re-run vulnerability scanners after patching to confirm the advisory no longer flags the host.
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-918: 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 lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-53830 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
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
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.
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:H/UI:N/S:C/C:H/I:H/A:H2.36GitHub_MVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
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-3wg4-mg27-hj4wCVE 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.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.