# CVE-2026-77818: Reflected HTML Injection via Form Hijacking in Yordam Informatics's Library Automation System

> Attackers can inject malicious HTML into web pages via reflected input, enabling content spoofing and potential session hijacking in the library automation system.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 4 Sep 2026
- **Updated:** 4 Sep 2026
- **Also known as:** GHSA-5fqf-rg4x-q9c6

## What is CVE-2026-77818?

CVE-2026-77818 is a medium-severity cross-site scripting vulnerability in Yordam Information Technology Consulting, Training and Electronic Systems Industry and Trade Inc. Library Information and Document Automation Program, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Yordam Information Technology Consulting, Training and Electronic Systems Industry and Trade Inc. Library Information and Document Automation Program allows Content Spoofing.

This issue affects Library Information and Document Automation Program: from v22.1 before v22.2.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-77818?


## How do I fix CVE-2026-77818?

No fix has been published for CVE-2026-77818 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-77818 being exploited?

There is no known exploitation of CVE-2026-77818 in the wild and no public exploit code.

Public exploit code:

- CVE-2026-77818 - Yordam Kütüphane Otomasyon Sistemi - Üç ayrı noktada yansıtılmış HTML enjeksiyonu, form action ele geçirme ve kimlik bilgisi hırsızlığı (CWE-79) (github_poc): https://github.com/alkimcoskun/Yordam-Kutuphane-Otomasyonunda-Coklu-HTML-Enjeksiyonu

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-77818 and fix it if it is affected.

What it is: CVE-2026-77818 is a medium-severity cross-site scripting vulnerability in Yordam Information Technology Consulting, Training and Electronic Systems Industry and Trade Inc. Library Information and Document Automation Program, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-77818 in the wild and no public exploit code.

Affected product: Yordam Information Technology Consulting, Training and Electronic Systems Industry and Trade Inc. Library Information and Document Automation Program. 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-2026-77818/ (Markdown: https://insights.sbomify.com/CVE-2026-77818/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-77818
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-77818
- OSV: https://osv.dev/vulnerability/CVE-2026-77818

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-77818/
Summaries are generated and may contain mistakes; the official description above is the record.