CVE-2026-26721Public exploitNetwork attack vector

Session hijacking via URL-exposed session identifiers

Published Feb 20, 2026 · Updated Feb 20, 2026

Session identifier exposure in Key Systems Inc Global Facilities Management Software 20230721a allows remote attackers to hijack sessions. The application appends the sid token to GET-request URLs instead of keeping it in a secure cookie, exposing it through browser history, server logs, Referer headers, monitored traffic, and shared links. Exploitation requires a valid sid obtained from a victim's session; replaying it in another browser grants that session's application access and privileges without the victim's credentials.

CVSS severity7.1
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session identifier exposure in Key Systems Inc Global Facilities Management Software 20230721a allows remote attackers to hijack sessions. The application appends the sid token to GET-request URLs instead of keeping it in a secure cookie, exposing it through browser history, server logs, Referer headers, monitored traffic, and shared links. Exploitation requires a valid sid obtained from a victim's session; replaying it in another browser grants that session's application access and privileges without the victim's credentials.

The record

CVE
CVE-2026-26721
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-598, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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-598Use of GET Request Method With Sensitive Query Strings
T1550.004Web Session Cookie

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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