CVE-2020-37071 — CraftCMS vCard Plugin: untrusted data deserialization leading to remote code execution

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Craftcms Craft Cms).
2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
4. Search available logs for exploit probes matching the vulnerability class (insecure deserialization), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-502 · Deserialization of Untrusted Data

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.73%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Monitor serialized objects in requests and unexpected processes spawned by the runtime.

Analysis and videos

CVE-2020-37071: CraftCMS vCard Plugin: untrusted data deserialization leading to remote code execution
CVE-2020-37071 affects the CraftCMS 3 vCard Plugin 1.0.0 and is classified as CWE-502 (deserialization of untrusted data). The record describes unauthenticated arbitrary PHP code execution through the plugin's vCard download functionality, and it carries a critical CVSS 3.1 score of 9.8. The record lists no affected or fixed version data and no confirmed exploitation in the sources consulted.

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · craftcms/craftcms
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 13, 2026
• CVSS changed · 9.8
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · → Deferred
  Oct 13, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 13, 2026 · NIST National Vulnerability Database
• CVE published
  Feb 3, 2026 · VulnCheck

Source activity

Repeated readings are counted rather than listed.

• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

5 on the record

• plugins.craftcms.com/vcard
  product, NIST National Vulnerability Database
• www.vulncheck.com/advisories/craftcms-vcard-plugin-remote-code-execution
  third-party-advisory, NIST National Vulnerability Database
• www.exploit-db.com/exploits/48492
  exploit, NIST National Vulnerability Database
• craftcms.com/
  product, NIST National Vulnerability Database
• gitlab.com/wguest/craftcms-vcard-exploit
  technical-description, exploit, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• Medium CVE-2026-33162 Craft CMS: Authorization bypass in "entries/move-to-section" allows control panel user to move entries without section permissions Mar 24, 2026
• Medium CVE-2026-33161 Craft CMS: Anonymous "assets/image-editor" calls returns private asset editor metadata to unauthorized users Mar 24, 2026
• Medium CVE-2026-33160 Craft CMS: Anonymous "generate transform" calls for assets can expose private assets via transform URL Mar 24, 2026
• Medium CVE-2026-33159 Craft CMS: Unauthenticated users could execute project configuration sync operations that should be restricted trusted users Mar 24, 2026
• High CVE-2026-33157 Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior Mar 24, 2026
• Medium CVE-2026-33158 Craft CMS: Low-privilege users could read private asset contents when editing an asset (IDOR) Mar 24, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No fixed version, patch or mitigation documented.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2020-37071 is "CraftCMS vCard Plugin: untrusted data deserialization leading to remote code execution", rated Critical. It affects Craft Cms (Craftcms); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.8 describes technical severity. EPSS 0.73% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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