CVE-2025-15579Public exploitNetwork attack vector

Unauthenticated code execution via signed-cookie length confusion

Published Feb 18, 2026 · Updated Feb 18, 2026

Object injection in OpenText Directory Services before 24.4.16 allows remote attackers to execute code via a crafted OTDSRESULTS cookie. The cookieToMap method uses attacker-controlled segment lengths outside the HMAC, letting a shifted IV/message boundary reach ObjectInputStream.readObject. Also affected are 25.1 before 25.1.9, 25.2 before 25.2.9, 25.3 before 25.3.8, 25.4 before 25.4.5, and 26.1 before 26.1.2; default configurations expose the unauthenticated chain, which can interrupt service or elevate privileges.

CVSS severity9.5
Critical
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Object injection in OpenText Directory Services before 24.4.16 allows remote attackers to execute code via a crafted OTDSRESULTS cookie. The cookieToMap method uses attacker-controlled segment lengths outside the HMAC, letting a shifted IV/message boundary reach ObjectInputStream.readObject. Also affected are 25.1 before 25.1.9, 25.2 before 25.2.9, 25.3 before 25.3.8, 25.4 before 25.4.5, and 26.1 before 26.1.2; default configurations expose the unauthenticated chain, which can interrupt service or elevate privileges.

The record

CVE
CVE-2025-15579
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
OpenText
Product
OpenText Directory Services
Classifications
CWE-502, CAPEC-586, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 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=10.5 <=26.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenText · OpenText Directory Servicesversion=10.5 <=26.1

Published CVSS scores

9.5OpenTextCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1190Exploit Public-Facing Application

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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