CVE-2026-9507Network attack vector

Account hijacking via retained pre-authentication session identifier

Published Jun 16, 2026 · Updated Jun 16, 2026

Session fixation in Enhancesoft osTicket 1.18.2 allows remote attackers to hijack a victim's account through a planted session cookie. The login flow retains the pre-authentication OSTSESSID value instead of invalidating the cookie or generating a new authenticated identifier. The attacker must first place a known identifier in the victim's browser and wait for the victim to authenticate, after which the session grants the victim's account access.

CVSS severity5.1
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session fixation in Enhancesoft osTicket 1.18.2 allows remote attackers to hijack a victim's account through a planted session cookie. The login flow retains the pre-authentication OSTSESSID value instead of invalidating the cookie or generating a new authenticated identifier. The attacker must first place a known identifier in the victim's browser and wait for the victim to authenticate, after which the session grants the victim's account access.

The record

CVE
CVE-2026-9507
Published
Jun 16, 2026
Updated
Jun 16, 2026
Vendor
Enhancesoft, LLC
Product
osTicket
Classifications
CWE-38, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 16, 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=1.18.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Enhancesoft, LLC · osTicketversion=1.18.2

Published CVSS scores

5.1Spanish National Cybersecurity Institute, S.A. (INCIBE)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-38Path Traversal: '\absolute\pathname\here'
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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