CVE-2026-1774Public exploitNetwork attack vector

Authorization bypass via unsanitized condition paths

Published Feb 10, 2026 · Updated Feb 10, 2026

Prototype pollution in CASL @casl/ability 2.4.0 through 6.7.4 allows remote attackers to alter inherited object properties. The extra module's rulesToFields() calls setByPath(), which treats proto, constructor, and prototype path segments as writable keys. Exploitation requires an application to pass attacker-controlled rule conditions to rulesToFields; polluted properties bypass authorization, disrupt application logic, or crash the Node.js process.

CVSS severity9.8
Critical
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in CASL @casl/ability 2.4.0 through 6.7.4 allows remote attackers to alter inherited object properties. The extra module's rulesToFields() calls setByPath(), which treats proto, constructor, and prototype path segments as writable keys. Exploitation requires an application to pass attacker-controlled rule conditions to rulesToFields; polluted properties bypass authorization, disrupt application logic, or crash the Node.js process.

The record

CVE
CVE-2026-1774
Published
Feb 10, 2026
Updated
Feb 10, 2026
Vendor
CASL
Product
@casl/ability
Classifications
CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.4.0 <=6.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CASL · @casl/abilityversion=2.4.0 <=6.7.4

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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