# CVE-2026-23843: teklifolustur_app's IDOR vulnerability allows unauthorized access to other users' offers

> Authenticated users can access other users' quotes by manipulating the offer_id parameter due to missing authorization checks.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Jan 2026
- **Updated:** 20 Jan 2026
- **Also known as:** GHSA-6h9r-mmg3-cg7m

## What is CVE-2026-23843?

CVE-2026-23843 is a high-severity missing authorization vulnerability in sibercii6-crypto teklifolustur_app, published on 19 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

teklifolustur_app is a web-based PHP application that allows users to create, manage, and track quotes for their clients. Prior to commit dd082a134a225b8dcd401b6224eead4fb183ea1c, an Insecure Direct Object Reference (IDOR) vulnerability exists in the offer view functionality. Authenticated users can manipulate the offer_id parameter to access offers belonging to other users. The issue is caused by missing authorization checks ensuring that the requested offer belonged to the currently authenticated user. Commit dd082a134a225b8dcd401b6224eead4fb183ea1c contains a patch.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-23843?


## How do I fix CVE-2026-23843?

No fix has been published for CVE-2026-23843 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23843 being exploited?

There is no known exploitation of CVE-2026-23843 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23843 and fix it if it is affected.

What it is: CVE-2026-23843 is a high-severity missing authorization vulnerability in sibercii6-crypto teklifolustur_app, published on 19 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-23843 in the wild and no public exploit code.

Affected product: sibercii6-crypto teklifolustur_app. 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-2026-23843/ (Markdown: https://insights.sbomify.com/CVE-2026-23843/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23843
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23843
- OSV: https://osv.dev/vulnerability/CVE-2026-23843

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23843/
Summaries are generated and may contain mistakes; the official description above is the record.