# CVE-2026-80428: ILIAS PHP Object Injection via Shibboleth Logout

> Unauthenticated attackers can achieve remote code execution in ILIAS by injecting serialized objects via LTI and triggering deserialization through the Shibboleth logout endpoint.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Aug 2026
- **Updated:** 30 Sep 2026
- **Also known as:** GHSA-6h76-35rh-gxm9

## What is CVE-2026-80428?

CVE-2026-80428 is a critical unsafe deserialization vulnerability in ILIAS-eLearning e.V. ILIAS, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ILIAS before versions 9.22, 10.10, and 11.3 contains an unauthenticated PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by injecting serialized objects through the LTI authentication endpoint and triggering deserialization via the Shibboleth back-channel logout endpoint. Attackers can write arbitrary serialized objects into session storage, then exploit an available POP gadget through the logout endpoint's unrestricted deserialization to write attacker-controlled PHP content to a web-accessible path and achieve remote code execution as the web server user.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2026-80428?


## How do I fix CVE-2026-80428?

No fix has been published for CVE-2026-80428 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-80428 being exploited?

There is no known exploitation of CVE-2026-80428 in the wild and no public exploit code.

Public exploit code:

- ILIAS ≤ 9.21 / 10.9 / 11.2 — Unauthenticated PHP Object Injection (RCE) (github_poc): https://github.com/HackfutSecRoot/CVE-2026-80428
- CVE-2026-80428 PoC (github_poc): https://github.com/digiprosec/CVE-2026-80428
- CVE-2026-80428 Unauthenticated PHP Object Injection via Shibboleth - ILIAS < 9.22_ 10.0 < 10.10_ 11.0 < 11.3 - RCE (exploitdb)
- https://github.com/shivammittal2403/cve-2026-80428-ctf (github_poc): https://github.com/shivammittal2403/cve-2026-80428-ctf

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-80428 and fix it if it is affected.

What it is: CVE-2026-80428 is a critical unsafe deserialization vulnerability in ILIAS-eLearning e.V. ILIAS, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-80428 in the wild and no public exploit code.

Affected product: ILIAS-eLearning e.V. ILIAS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-80428/ (Markdown: https://insights.sbomify.com/CVE-2026-80428/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-80428
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-80428
- OSV: https://osv.dev/vulnerability/CVE-2026-80428

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-80428/
Summaries are generated and may contain mistakes; the official description above is the record.