CVE-2026-11956Network attack vector

Session hijacking via missing OIDC cookie flags

Published Jun 11, 2026 · Updated Jun 11, 2026

Sensitive cookie exposure in TwiN Gatus 5.36.0 allows attackers to obtain an OIDC session identifier through an insecure session cookie. The setSessionCookie function in security/oidc.go sends the identifier without Secure or HttpOnly, permitting plaintext transmission and script access. Exploitation requires an HTTP interception path or script execution in the Gatus origin; replay grants access to protected dashboard data.

CVSS severity6.3
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive cookie exposure in TwiN Gatus 5.36.0 allows attackers to obtain an OIDC session identifier through an insecure session cookie. The setSessionCookie function in security/oidc.go sends the identifier without Secure or HttpOnly, permitting plaintext transmission and script access. Exploitation requires an HTTP interception path or script execution in the Gatus origin; replay grants access to protected dashboard data.

The record

CVE
CVE-2026-11956
Published
Jun 11, 2026
Updated
Jun 11, 2026
Vendor
TwiN
Product
Gatus
Classifications
CWE-1004, CWE-614, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 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=5.36.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TwiN · Gatusversion=5.36.0

Published CVSS scores

2.6VulDBAV:N/AC:H/Au:N/C:P/I:N/A:N
3.7VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
6.3VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-1004Sensitive Cookie Without 'HttpOnly' Flag
CWE-614Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
T1539Steal Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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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