Security readout for executives and security teams
Plain-English summary
CouchCMS 2.2.1 lets a logged-in attacker abuse SVG uploads so the server makes HTTP requests on the attacker’s behalf. This can expose internal services the attacker cannot reach directly. The business risk depends on whether CouchCMS is internet-facing, who can upload files, and what internal resources the server can access.
Executive priority
Treat this as a moderate-priority exposure review. It is not KEV-listed, but public exploit information exists and SSRF can become serious when the CMS server has trusted internal network access.
Technical view
The issue is CWE-918 server-side request forgery in CouchCMS 2.2.1. Sources describe authenticated upload of malicious SVG files through browse.php using external entity references, causing arbitrary server-side HTTP requests. CVSS v4.0 is 5.3, with low complexity and low privileges required.
Likely exposure
Exposure is most likely where CouchCMS 2.2.1 is deployed and authenticated users can access file upload functionality. Risk rises if the CMS server can reach internal admin panels, cloud metadata services, or private APIs.
Exploitation context
The source bundle includes an ExploitDB reference, so public exploit information exists. CISA KEV status is false, and the provided sources do not state active exploitation in the wild.
Researcher notes
Do not assume unauthenticated exposure from the provided sources. Validate version, upload permissions, SVG handling, and server egress paths. The sources do not name a patch, so remediation should be tied to vendor guidance and compensating controls.
Mitigation direction
- Inventory CouchCMS deployments and identify any running version 2.2.1.
- Check CouchCMS vendor guidance for an official fix or upgrade path.
- Restrict file upload access to trusted users only.
- Temporarily disable SVG uploads if business processes allow.
- Limit server egress to required destinations only.
- Block CMS server access to sensitive internal and metadata endpoints.
Validation and detection
- Confirm whether CouchCMS version 2.2.1 is present in production or staging.
- Verify whether authenticated users can upload SVG files through browse.php.
- Review web and proxy logs for unexpected outbound requests from the CMS server.
- Check network controls blocking access to private internal ranges from the CMS host.
- Confirm any vendor-recommended update or configuration change has been applied.
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-2021-47958 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
- Medium
- CVSS
- 5.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
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
2 official scoresWe 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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L——VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N2.81.4VulnCheckVulnerability scoring details
Base CVSS 4.0 score
5.3MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
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
- ExploitDB-49675CVE reference, VulnCheck · exploit
- Official Product HomepageCVE reference, VulnCheck · product
- VulnCheck Advisory: CouchCMS 2.2.1 Server-Side Request Forgery via SVG uploadCVE reference, VulnCheck · third-party-advisory
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.