CVE-2026-9507

A session fixation vulnerability has been identified in osTicket v1.18.2. This security flaw allows an attacker to hijack a victim’s account by keeping the initial session identifier (OSTSESSID) active after a successful login. The issue lies in the fact that the application does not invalidate the pre-authentication cookie or generate a new identifier for the authenticated context. As a result, if an attacker manages to set a known session identifier in the victim’s browser, they will be able to maintain unauthorised access to the account once the victim has authenticated.

CVSS

No CVSS.

References

Link	Resource
https://www.incibe.es/en/incibe-cert/notices/aviso/session-fixation-vulnerability-enhancesofts-osticket

Configurations

No configuration.

History

16 Jun 2026, 13:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-16 13:16

Updated : 2026-06-17 11:05

NVD link : CVE-2026-9507

Mitre link : CVE-2026-9507

CVE.ORG link : CVE-2026-9507

JSON object : View

Products Affected

No product.

CWE

CWE-38

Path Traversal: '\absolute\pathname\here'

{"id": "CVE-2026-9507", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-9507", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-06-16T16:18:00.355878Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "cve-coordination@incibe.es", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 5.1, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cve-coordination@incibe.es", "affectedData": [{"vendor": "Enhancesoft", "product": "osTicket", "versions": [{"status": "affected", "version": "1.18.2"}], "defaultStatus": "unaffected"}]}], "published": "2026-06-16T13:16:38.140", "references": [{"url": "https://www.incibe.es/en/incibe-cert/notices/aviso/session-fixation-vulnerability-enhancesofts-osticket", "source": "cve-coordination@incibe.es"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "cve-coordination@incibe.es", "description": [{"lang": "en", "value": "CWE-38"}]}], "descriptions": [{"lang": "en", "value": "A session fixation vulnerability has been identified in osTicket v1.18.2. This security flaw allows an attacker to hijack a victim\u2019s account by keeping the initial session identifier (OSTSESSID) active after a successful login.\n\n\n\nThe issue lies in the fact that the application does not invalidate the pre-authentication cookie or generate a new identifier for the authenticated context. As a result, if an attacker manages to set a known session identifier in the victim\u2019s browser, they will be able to maintain unauthorised access to the account once the victim has authenticated."}], "lastModified": "2026-06-17T11:05:23.500", "sourceIdentifier": "cve-coordination@incibe.es"}