CVE-2026-43828Network attack vector

Session-cookie disclosure via missing Secure attribute

Published May 25, 2026 · Updated May 25, 2026

Cookie protection failure in Apache Shiro 1.0 through 2.1.0 and 3.0.0-alpha-1 allows remote attackers to intercept session cookies. Native-session and persistent-login managers emit sensitive authentication cookies without setting the Secure attribute by default. Exploitation requires an authenticated browser to transmit the cookie over an unencrypted connection; exposure is limited to cookie confidentiality.

CVSS severity5.9
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cookie protection failure in Apache Shiro 1.0 through 2.1.0 and 3.0.0-alpha-1 allows remote attackers to intercept session cookies. Native-session and persistent-login managers emit sensitive authentication cookies without setting the Secure attribute by default. Exploitation requires an authenticated browser to transmit the cookie over an unencrypted connection; exposure is limited to cookie confidentiality.

The record

CVE
CVE-2026-43828
Published
May 25, 2026
Updated
May 25, 2026
Vendor
The Apache Software Foundation
Product
Apache Shiro
Classifications
CWE-614, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 25, 2026CVE publishedPublication date reported by the CVE source.
  2. May 25, 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=1.0 <=2.1.0
  2. Affected versionversion=3.0.0-alpha-0 <=3.0.0-alpha-1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Shiroversion=1.0 <=2.1.0; version=3.0.0-alpha-0 <=3.0.0-alpha-1

Published CVSS scores

5.9Apache Software FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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.

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

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 exploitUnconfirmed

Weakness, pattern, technique

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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