CVE-2023-26136Public exploitNetwork attack vector

Cookie disclosure via prototype-polluting domain key

Published Jul 1, 2023 · Updated Aug 27, 2025

Prototype pollution in Salesforce tough-cookie before 4.1.3 allows attackers to expose stored cookies through a crafted domain value. MemoryCookieStore indexes cookies in ordinary JavaScript objects, so a proto domain key writes cookie paths into Object.prototype. Exposure requires a CookieJar with rejectPublicSuffixes=false and the default MemoryCookieStore, and it lasts only for the running process.

CVSS severity6.5
Medium
EPSS probability2.54%
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 Salesforce tough-cookie before 4.1.3 allows attackers to expose stored cookies through a crafted domain value. MemoryCookieStore indexes cookies in ordinary JavaScript objects, so a proto domain key writes cookie paths into Object.prototype. Exposure requires a CookieJar with rejectPublicSuffixes=false and the default MemoryCookieStore, and it lasts only for the running process.

The record

CVE
CVE-2023-26136
Published
Jul 1, 2023
Updated
Aug 27, 2025
Vendor
Salesforce
Product
tough-cookie
Classifications
CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2025Record 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=0 <4.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Salesforce · tough-cookieversion=0 <4.1.3

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Prototype 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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