CVE Intelligence
High Injection exploit reference

CVE-2020-5258 — Prototype pollution in dojo

In affected versions of dojo (NPM package), the deepCopy method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Published Mar 10, 2020 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: GitHub_M

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 4% (30-day exploitation probability)+14
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

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

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
4.02%
ahead of 90% of scored CVEs · Oct 14, 2026
Affects
Debian
Debian Linux and 9 more
CVSS base
7.7
High · 3 source(s)

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.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

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

  • Documented patch — github.com (NIST National Vulnerability Database)
  • Documented patch — www.oracle.com (NIST National Vulnerability Database)
  • Documented patch — www.oracle.com (NIST National Vulnerability Database)
  • Documented patch — www.oracle.com (NIST National Vulnerability Database)

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 (Debian Debian Linux, Dojo Dojo, Linuxfoundation Dojo…).
  2. Apply the fixed version or the patch documented under Remediation.
  3. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
  4. EPSS ahead of 90% of scored CVEs: prioritize it in the patch queue.
  5. Search available logs for exploit probes matching the vulnerability class (injection), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Debian Debian Linux version 8.0 Vulnerable NIST National Vulnerability Database
Dojo Dojo version >= 1.16.0, < 1.16.2version >= 1.15.0, < 1.15.3version >= 1.14.0, < 1.14.6version >= 1.13.0, < 1.13.7version < 1.12.8 Vulnerable CVE Program (cve.org) e CISA ADP
Linuxfoundation Dojo ≥ 1.15.0 and < 1.15.3< 1.11.10≥ 1.12.0 and < 1.12.8≥ 1.13.0 and < 1.13.7≥ 1.14.0 and < 1.14.6≥ 1.16.0 and < 1.16.2 Vulnerable NIST National Vulnerability Database
Oracle Communications Application Session Controller version 3.9.0 Vulnerable NIST National Vulnerability Database
Oracle Communications Policy Management version 12.5.0 Vulnerable NIST National Vulnerability Database
Oracle Communications Pricing Design Center version 12.0.0.3.0 Vulnerable NIST National Vulnerability Database
Oracle Documaker ≥ 12.6.0 and ≤ 12.6.4 Vulnerable NIST National Vulnerability Database
Oracle Mysql ≥ 7.5.0 and ≤ 7.5.18≥ 8.0.0 and ≤ 8.0.20≥ 7.6.0 and ≤ 7.6.14≥ 7.4.0 and ≤ 7.4.28≥ 7.3.0 and ≤ 7.3.29 Vulnerable NIST National Vulnerability Database
Oracle Primavera Unifier version 20.12version 19.12version 18.8≥ 17.7 and ≤ 17.12 Vulnerable NIST National Vulnerability Database
Oracle Webcenter Sites version 12.2.1.4.0version 12.2.1.3.0 Vulnerable NIST National Vulnerability Database
Oracle Weblogic Server version 14.1.1.0.0version 12.2.1.4.0 Vulnerable NIST National Vulnerability Database

Attack characteristics

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

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

Every base score collected

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

ScoreVersionSeverityExpl.ImpactScored by
7.7 CVSS 3.1 High 1.3 5.8 security-advisories@github.com via NIST National Vulnerability Database
7.7 CVSS 3.1 High — — GitHub_M via CVE Program (cve.org) e CISA ADP
7.5 CVSS 3.1 High 3.9 3.6 nvd@nist.gov via NIST National Vulnerability Database
5.0 CVSS 2.0 Medium 10.0 2.9 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N (score shown at the top: security-advisories@github.com)
Scoring entities (NIST, CNA, ADP) score independently; each score is shown with its origin. For prioritization we use 7.7 (security-advisories@github.com via NIST National Vulnerability Database) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-1321 · Prototype Pollution

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 4.02%

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).
  • Look for parameters with command/query metacharacters and unexpected child processes of the service.
web/proxy/WAF logsnetwork IDS/IPSapplication logsendpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · dojo/dojo
    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
  • Fix documented
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 7.7
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Modified
    Oct 13, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 13, 2026 · NIST National Vulnerability Database
  • 2020
  • CVE published
    Mar 10, 2020 · GitHub_M

Source activity

Repeated readings are counted rather than listed.

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

References

11 on the record

Elsewhere on this site

Debian
every CVE for this vendor
Injection
same class
CWE-1321
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-83038 Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component:... Sep 15, 2026
  • CVE-2026-12996 A use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote... Jul 30, 2026
  • CVE-2026-61140 Improper Access Control in Oracle Webcenter Sites Jul 21, 2026
  • CVE-2026-60554 Exposure of Sensitive Information in Oracle Webcenter Sites Jul 21, 2026
  • CVE-2026-60552 Exposure of Sensitive Information in Oracle Webcenter Sites Jul 21, 2026
  • CVE-2026-60553 Exposure of Sensitive Information in Oracle Webcenter Sites Jul 21, 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 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-2020-5258 is "Prototype pollution in dojo", rated High. It affects Debian Linux (Debian); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.7 describes technical severity. EPSS 4.02% 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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