CVE-2026-80428Network attack vectorHinoki check available

Unauthenticated code execution via unsafe session deserialization

Published Aug 26, 2026 · Updated Aug 26, 2026

PHP object injection in ILIAS before 9.22, 10.10 and 11.3 allows remote attackers to execute code via the Shibboleth logout endpoint. The unauthenticated handler scans live session rows and calls unserialize on each stored value without restricting constructible classes. An unauthenticated LTI request can seed a session with a gadget whose destructor writes attacker-controlled content below the web root, enabling execution as the web server user.

CVSS severity9.3
Critical
EPSS probability2.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

PHP object injection in ILIAS before 9.22, 10.10 and 11.3 allows remote attackers to execute code via the Shibboleth logout endpoint. The unauthenticated handler scans live session rows and calls unserialize on each stored value without restricting constructible classes. An unauthenticated LTI request can seed a session with a gadget whose destructor writes attacker-controlled content below the web root, enabling execution as the web server user.

The record

CVE
CVE-2026-80428
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
ILIAS open source e-Learning e.V.
Product
ILIAS
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=0 <9.22
  2. Affected versionversion=10.0 <10.10
  3. Affected versionversion=11.0 <11.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ILIAS open source e-Learning e.V. · ILIASversion=0 <9.22; version=10.0 <10.10; version=11.0 <11.3

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

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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